An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9. Local attackers on systems with the speakup driver could cause a local denial of service attack, aka CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.

According to the versions of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - The kernel package contains the Linux kernel (vmlinuz),     the core of any Linux operating system. The kernel     handles the basic functions of the operating system:
    memory allocation, process allocation, device input and     output, etc. Security Fix(es):A vulnerability was found     in the Linux Kernel where the function sunkbd_reinit     having been scheduled by sunkbd_interrupt before sunkbd     being freed. Though the dangling pointer is set to NULL     in sunkbd_disconnect, there is still an alias in     sunkbd_reinit causing Use After Free.(CVE-2020-25669)An     issue was discovered in the Linux kernel through 5.9.1,     as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel     removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL     pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized     device, aka CID-073d0552ead5.(CVE-2020-27675)An issue     was discovered in the Linux kernel through 5.9.1, as     used with Xen through 4.14.x. Guest OS users can cause     a denial of service (host OS hang) via a high rate of     events to dom0, aka CID-e99502f76271.(CVE-2020-27673)An     issue was discovered in __split_huge_pmd in     mm/huge_memory.c in the Linux kernel before 5.7.5. The     copy-on-write implementation can grant unintended write     access because of a race condition in a THP mapcount     check, aka CID-c444eb564fb1.(CVE-2020-29368)An issue     was discovered in     drivers/accessibility/speakup/spk_ttyio.c in the Linux     kernel through 5.9.9. Local attackers on systems with     the speakup driver could cause a local denial of     service attack, aka CID-d41227544427. This occurs     because of an invalid free when the line discipline is     used more than once.(CVE-2020-28941)** DISPUTED **     fsfsd fs3xdr.c in the Linux kernel through 5.10.8, when     there is an NFS export of a subdirectory of a     filesystem, allows remote attackers to traverse to     other parts of the filesystem via READDIRPLUS. NOTE:
    some parties argue that such a subdirectory export is     not intended to prevent this attack see also the     exports(5) no_subtree_check default     behavior.(CVE-2021-3178)An issue was discovered in the     Linux kernel through 5.11.3.
    drivers/scsi/scsi_transport_iscsi.c is adversely     affected by the ability of an unprivileged user to     craft Netlink messages.(CVE-2021-27364)An issue was     discovered in the Linux kernel through 5.11.3. A kernel     pointer leak can be used to determine the address of     the iscsi_transport structure. When an iSCSI transport     is registered with the iSCSI subsystem, the transport's     handle is available to unprivileged users via the sysfs     file system, at     /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When     read, the show_transport_handle function (in     drivers/scsi/scsi_transport_iscsi.c) is called, which     leaks the handle. This handle is actually the pointer     to an iscsi_transport struct in the kernel module's     global variables.(CVE-2021-27363)ntfs_read_locked_inode     in the ntfs.ko filesystem driver in the Linux kernel     4.15.0 allows attackers to trigger a use-after-free     read and possibly cause a denial of service (kernel     oops or panic) via a crafted ntfs     filesystem.(CVE-2018-12929)In the Linux kernel 4.15.0,     a NULL pointer dereference was discovered in     hfs_ext_read_extent in hfs.ko. This can occur during a     mount of a crafted hfs     filesystem.(CVE-2018-12928)rtw_wx_set_scan in     drivers/staging/rtl8188eu/os_dep/ioctl_linux.c in the     Linux kernel through 5.11.6 allows writing beyond the     end of the ->ssid[] array. NOTE: from the perspective     of kernel.org releases, CVE IDs are not normally used     for drivers/staging/* (unfinished work) however, system     integrators may have situations in which a     drivers/staging issue is relevant to their own customer     base.(CVE-2021-28660)There is a flaw reported in the     Linux kernel in versions before 5.9 in drivers/gpu/drm     ouveau ouveau_sgdma.c in nouveau_sgdma_create_ttm in     Nouveau DRM subsystem. The issue results from the lack     of validating the existence of an object prior to     performing operations on the object. An attacker with a     local account with a root privilege, can leverage this     vulnerability to escalate privileges and execute code     in the context of the kernel.(CVE-2021-20292)A flaw was     found in the Nosy driver in the Linux kernel. This     issue allows a device to be inserted twice into a     doubly-linked list, leading to a use-after-free when     one of these devices is removed. The highest threat     from this vulnerability is to confidentiality,     integrity, as well as system availability. Versions     before kernel 5.12-rc6 are affected(CVE-2021-3483)In     drivers/pci/hotplug/rpadlpar_sysfs.c in the Linux     kernel through 5.11.8, the RPA PCI Hotplug driver has a     user-tolerable buffer overflow when writing a new     device name to the driver from userspace, allowing     userspace to write data to the kernel stack frame     directly. This occurs because add_slot_store and     remove_slot_store mishandle drc_name '\0' termination,     aka CID-cc7a0bb058b8.(CVE-2021-28972)A race condition     was discovered in get_old_root in fs/btrfs/ctree.c in     the Linux kernel through 5.11.8. It allows attackers to     cause a denial of service (BUG) because of a lack of     locking on an extent buffer before a cloning operation,     aka CID-dbcc7d57bffc.(CVE-2021-28964)An issue was     discovered in the Linux kernel before 5.11.7.
    usbip_sockfd_store in drivers/usb/usbip/stub_dev.c     allows attackers to cause a denial of service (GPF)     because the stub-up sequence has race conditions during     an update of the local and shared status, aka     CID-9380afd6df70.(CVE-2021-29265)The fix for XSA-365     includes initialization of pointers such that     subsequent cleanup code wouldn't use uninitialized or     stale values. This initialization went too far and may     under certain conditions also overwrite pointers which     are in need of cleaning up. The lack of cleanup would     result in leaking persistent grants. The leak in turn     would prevent fully cleaning up after a respective     guest has died, leaving around zombie domains. All     Linux versions having the fix for XSA-365 applied are     vulnerable. XSA-365 was classified to affect versions     back to at least 3.11.(CVE-2021-28688)An issue was     discovered in the Linux kernel before 5.11.3 when a     webcam device exists. video_usercopy in     drivers/media/v4l2-core/v4l2-ioctl.c has a memory leak     for large arguments, aka     CID-fb18802a338b.(CVE-2021-30002)An issue was     discovered in the Linux kernel before 5.8.10.
    virt/kvm/kvm_main.c has a kvm_io_bus_unregister_dev     memory leak upon a kmalloc failure, aka     CID-f65886606c2d.(CVE-2020-36312)An issue was     discovered in the Linux kernel before 5.9.
    arch/x86/kvm/svm/sev.c allows attackers to cause a     denial of service (soft lockup) by triggering     destruction of a large SEV VM (which requires     unregistering many encrypted regions), aka     CID-7be74942f184.(CVE-2020-36311)An issue was     discovered in the Linux kernel before 5.11.11.
    qrtr_recvmsg in net/qrtr/qrtr.c allows attackers to     obtain sensitive information from kernel memory because     of a partially uninitialized data structure, aka     CID-50535249f624.(CVE-2021-29647)An issue was     discovered in the Linux kernel through 5.11.10.
    driverset/ethernet/freescale/gianfar.c in the Freescale     Gianfar Ethernet driver allows attackers to cause a     system crash because a negative fragment size is     calculated in situations involving an rx queue overrun     when jumbo packets are used and NAPI is enabled, aka     CID-d8861bab48b6.(CVE-2021-29264)An out-of-bounds (OOB)     memory access flaw was found in x25_bind in     net/x25/af_x25.c in the Linux kernel version v5.12-rc5.
    A bounds check failure allows a local attacker with a     user account on the system to gain access to     out-of-bounds memory, leading to a system crash or a     leak of internal kernel information. The highest threat     from this vulnerability is to confidentiality,     integrity, as well as system     availability.(CVE-2020-35519)An issue was discovered in     the Linux kernel before 5.11.8. kernel/bpf/verifier.c     has an off-by-one error (with a resultant integer     underflow) affecting out-of-bounds speculation on     pointer arithmetic, leading to side-channel attacks     that defeat Spectre mitigations and obtain sensitive     information from kernel memory, aka     CID-10d2bb2e6b1d.(CVE-2020-27171)An issue was     discovered in the Linux kernel before 5.11.8.
    kernel/bpf/verifier.c performs undesirable     out-of-bounds speculation on pointer arithmetic,     leading to side-channel attacks that defeat Spectre     mitigations and obtain sensitive information from     kernel memory, aka CID-f232326f6966. This affects     pointer types that do not define a     ptr_limit.(CVE-2020-27170)BPF JIT compilers in the     Linux kernel through 5.11.12 have incorrect computation     of branch displacements, allowing them to execute     arbitrary code within the kernel context. This affects     arch/x86 et/bpf_jit_comp.c and arch/x86     et/bpf_jit_comp32.c.(CVE-2021-29154)A race condition in     Linux kernel SCTP sockets (net/sctp/socket.c) before     5.12-rc8 can lead to kernel privilege escalation from     the context of a network service or an unprivileged     process. If sctp_destroy_sock is called without     sock_net(sk)->sctp.addr_wq_lock then an element is     removed from the auto_asconf_splist list without any     proper locking. This can be exploited by an attacker     with network service privileges to escalate to root or     from the context of an unprivileged user directly if a     BPF_CGROUP_INET_SOCK_CREATE is attached which denies     creation of some SCTP socket.(CVE-2021-23133)An issue     was discovered in the FUSE filesystem implementation in     the Linux kernel before 5.10.6, aka CID-5d069dbe8aaf.
    fuse_do_getattr() calls make_bad_inode() in     inappropriate situations, causing a system crash. NOTE:
    the original fix for this vulnerability was incomplete,     and its incompleteness is tracked as     CVE-2021-28950.(CVE-2020-36322)An out-of-bounds (OOB)     memory write flaw was found in list_devices in     drivers/md/dm-ioctl.c in the Multi-device driver module     in the Linux kernel before 5.12. A bound check failure     allows an attacker with special user (CAP_SYS_ADMIN)     privilege to gain access to out-of-bounds memory     leading to a system crash or a leak of internal kernel     information. The highest threat from this vulnerability     is to system availability.(CVE-2021-31916)An issue was     discovered in the Linux kernel through 5.11.x.
    kernel/bpf/verifier.c performs undesirable     out-of-bounds speculation on pointer arithmetic,     leading to side-channel attacks that defeat Spectre     mitigations and obtain sensitive information from     kernel memory. Specifically, for sequences of pointer     arithmetic operations, the pointer modification     performed by the first operation is not correctly     accounted for when restricting subsequent     operations.(CVE-2021-29155)kernel/bpf/verifier.c in the     Linux kernel through 5.12.1 performs undesirable     speculative loads, leading to disclosure of stack     content via side-channel attacks, aka CID-801c6058d14a.
    The specific concern is not protecting the BPF stack     area against speculative loads. Also, the BPF stack can     contain uninitialized data that might represent     sensitive information previously operated on by the     kernel.(CVE-2021-31829)The Linux kernel before 5.11.14     has a use-after-free in cipso_v4_genopt in     net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO     refcounting for the DOI definitions is mishandled, aka     CID-ad5d07f4a9cd. This leads to writing an arbitrary     value.(CVE-2021-33033)kernel/bpf/verifier.c in the     Linux kernel through 5.12.7 enforces incorrect limits     for pointer arithmetic operations, aka     CID-bb01a1bba579. This can be abused to perform     out-of-bounds reads and writes in kernel memory,     leading to local privilege escalation to root. In     particular, there is a corner case where the off reg     causes a masking direction change, which then results     in an incorrect final aux->alu_limit.(CVE-2021-33200)An     issue was discovered in the Linux kernel through     5.11.3. Certain iSCSI data structures do not have     appropriate length constraints or checks, and can     exceed the PAGE_SIZE value. An unprivileged user can     send a Netlink message that is associated with iSCSI,     and has a length up to the maximum length of a Netlink     message.(CVE-2021-27365)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4750-1 advisory.

  - A vulnerability was found in the Linux Kernel where the function sunkbd_reinit having been scheduled by     sunkbd_interrupt before sunkbd being freed. Though the dangling pointer is set to NULL in     sunkbd_disconnect, there is still an alias in sunkbd_reinit causing Use After Free. (CVE-2020-25669)

  - A flaw was found in the JFS filesystem code in the Linux Kernel which allows a local attacker with the     ability to set extended attributes to panic the system, causing memory corruption or escalating     privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system     availability. (CVE-2020-27815)

  - A vulnerability was found in Linux Kernel where in the spk_ttyio_receive_buf2() function, it would     dereference spk_ttyio_synth without checking whether it is NULL or not, and may lead to a NULL-ptr deref     crash. (CVE-2020-27830)

  - An information disclosure vulnerability exists in the /proc/pid/syscall functionality of Linux Kernel 5.1     Stable and 5.4.66. More specifically, this issue has been introduced in v5.1-rc4 (commit     631b7abacd02b88f4b0795c08b54ad4fc3e7c7c0) and is still present in v5.10-rc4, so it's likely that all     versions in between are affected. An attacker can read /proc/pid/syscall to trigger this vulnerability,     which leads to the kernel leaking memory contents. (CVE-2020-28588)

  - An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9.
    Local attackers on systems with the speakup driver could cause a local denial of service attack, aka     CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
    (CVE-2020-28941)

  - An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are     processing watch events using a single thread. If the events are received faster than the thread is able     to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the     backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable. (CVE-2020-29568)

  - An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux     kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped.
    However, the handler may not have time to run if the frontend quickly toggles between the states connect     and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving     guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege     escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.
    (CVE-2020-29569)

  - A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID,     aka CID-c8bcd9c5be24. (CVE-2020-29660)

  - A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.
    (CVE-2020-29661)

  - A flaw was found in the Linux kernel's implementation of string matching within a packet. A privileged     user (with root or CAP_NET_ADMIN) when inserting iptables rules could insert a rule which can panic the     system. Kernel before kernel 5.5-rc1 is affected. (CVE-2021-20177)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4749-1 advisory.

  - A vulnerability was found in the Linux Kernel where the function sunkbd_reinit having been scheduled by     sunkbd_interrupt before sunkbd being freed. Though the dangling pointer is set to NULL in     sunkbd_disconnect, there is still an alias in sunkbd_reinit causing Use After Free. (CVE-2020-25669)

  - A flaw was found in the JFS filesystem code in the Linux Kernel which allows a local attacker with the     ability to set extended attributes to panic the system, causing memory corruption or escalating     privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system     availability. (CVE-2020-27815)

  - A vulnerability was found in Linux Kernel where in the spk_ttyio_receive_buf2() function, it would     dereference spk_ttyio_synth without checking whether it is NULL or not, and may lead to a NULL-ptr deref     crash. (CVE-2020-27830)

  - An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9.
    Local attackers on systems with the speakup driver could cause a local denial of service attack, aka     CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
    (CVE-2020-28941)

  - An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c. The     get_user_pages (aka gup) implementation, when used for a copy-on-write page, does not properly consider     the semantics of read operations and therefore can grant unintended write access, aka CID-17839856fd58.
    (CVE-2020-29374)

  - An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are     processing watch events using a single thread. If the events are received faster than the thread is able     to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the     backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable. (CVE-2020-29568)

  - An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux     kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped.
    However, the handler may not have time to run if the frontend quickly toggles between the states connect     and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving     guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege     escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.
    (CVE-2020-29569)

  - A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID,     aka CID-c8bcd9c5be24. (CVE-2020-29660)

  - A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.
    (CVE-2020-29661)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4751-1 advisory.

  - A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was     using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of     bounds. The highest threat from this vulnerability is to data confidentiality. (CVE-2020-25656)

  - A flaw was found in Linux Kernel because access to the global variable fg_console is not properly     synchronized leading to a use after free in con_font_op. (CVE-2020-25668)

  - A vulnerability was found in the Linux Kernel where the function sunkbd_reinit having been scheduled by     sunkbd_interrupt before sunkbd being freed. Though the dangling pointer is set to NULL in     sunkbd_disconnect, there is still an alias in sunkbd_reinit causing Use After Free. (CVE-2020-25669)

  - A flaw memory leak in the Linux kernel performance monitoring subsystem was found in the way if using     PERF_EVENT_IOC_SET_FILTER. A local user could use this flaw to starve the resources causing denial of     service. (CVE-2020-25704)

  - An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users     can cause a denial of service (host OS hang) via a high rate of events to dom0, aka CID-e99502f76271.
    (CVE-2020-27673)

  - An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5. (CVE-2020-27675)

  - A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked     down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries     platform) a root like local user could use this flaw to further increase their privileges to that of a     running kernel. (CVE-2020-27777)

  - A flaw was found in the JFS filesystem code in the Linux Kernel which allows a local attacker with the     ability to set extended attributes to panic the system, causing memory corruption or escalating     privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system     availability. (CVE-2020-27815)

  - A vulnerability was found in Linux Kernel where in the spk_ttyio_receive_buf2() function, it would     dereference spk_ttyio_synth without checking whether it is NULL or not, and may lead to a NULL-ptr deref     crash. (CVE-2020-27830)

  - A use after free in the Linux kernel infiniband hfi1 driver in versions prior to 5.10-rc6 was found in the     way user calls Ioctl after open dev file and fork. A local user could use this flaw to crash the system.
    (CVE-2020-27835)

  - An information disclosure vulnerability exists in the /proc/pid/syscall functionality of Linux Kernel 5.1     Stable and 5.4.66. More specifically, this issue has been introduced in v5.1-rc4 (commit     631b7abacd02b88f4b0795c08b54ad4fc3e7c7c0) and is still present in v5.10-rc4, so it's likely that all     versions in between are affected. An attacker can read /proc/pid/syscall to trigger this vulnerability,     which leads to the kernel leaking memory contents. (CVE-2020-28588)

  - An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9.
    Local attackers on systems with the speakup driver could cause a local denial of service attack, aka     CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
    (CVE-2020-28941)

  - A slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to     read privileged information or potentially crash the kernel, aka CID-3c4e0dff2095. This occurs because     KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for manipulations such as font height. (CVE-2020-28974)

  - An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are     processing watch events using a single thread. If the events are received faster than the thread is able     to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the     backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable. (CVE-2020-29568)

  - An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux     kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped.
    However, the handler may not have time to run if the frontend quickly toggles between the states connect     and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving     guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege     escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.
    (CVE-2020-29569)

  - A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID,     aka CID-c8bcd9c5be24. (CVE-2020-29660)

  - A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.
    (CVE-2020-29661)

  - A flaw possibility of race condition and incorrect initialization of the process id was found in the Linux     kernel child/parent process identification handling while filtering signal handlers. A local attacker is     able to abuse this flaw to bypass checks to send any signal to a privileged process. (CVE-2020-35508)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the kernel packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - In create_pinctrl of core.c, there is a possible out of     bounds read due to a use after free. This could lead to     local information disclosure with no additional     execution privileges needed.(CVE-2020-0427)

  - NULL-ptr deref in the spk_ttyio_receive_buf2() function     in spk_ttyio.c.(CVE-2020-27830)

  - In do_epoll_ctl and ep_loop_check_proc of eventpoll.c,     there is a possible use after free due to a logic     error. This could lead to local escalation of privilege     with no additional execution privileges     needed.(CVE-2020-0466)

  - In the nl80211_policy policy of nl80211.c, there is a     possible out of bounds read due to a missing bounds     check. This could lead to local information disclosure     with System execution privileges     needed.(CVE-2020-27068)

  - use-after-free read in sunkbd_reinit in     drivers/input/keyboard/sunkbd.c.(CVE-2020-25669)

  - A flaw was found in the Linux kernels implementation of     MIDI, where an attacker with a local account and the     permissions to issue an ioctl commands to midi devices,     could trigger a use-after-free. A write to this     specific memory while freed and before use could cause     the flow of execution to change and possibly allow for     memory corruption or privilege     escalation.(CVE-2020-27786)

  - An issue was discovered in romfs_dev_read in     fs/romfs/storage.c in the Linux kernel before 5.8.4.
    Uninitialized memory leaks to userspace, aka     CID-bcf85fcedfdd.(CVE-2020-29371)

  - A slab-out-of-bounds read in fbcon in the Linux kernel     before 5.9.7 could be used by local attackers to read     privileged information or potentially crash the kernel,     aka CID-3c4e0dff2095. This occurs because     KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for     manipulations such as font height.(CVE-2020-28974)

  - A locking inconsistency issue was discovered in the tty     subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may     allow a read-after-free attack against TIOCGSID, aka     CID-c8bcd9c5be24.(CVE-2020-29660)

  - A locking issue was discovered in the tty subsystem of     the Linux kernel through 5.9.13.
    drivers/tty/tty_jobctrl.c allows a use-after-free     attack against TIOCSPGRP, aka     CID-54ffccbf053b.(CVE-2020-29661)

  - An issue was discovered in     drivers/accessibility/speakup/spk_ttyio.c in the Linux     kernel through 5.9.9. Local attackers on systems with     the speakup driver could cause a local denial of     service attack, aka CID-d41227544427. This occurs     because of an invalid free when the line discipline is     used more than once.(CVE-2020-28941)

  - A buffer over-read (at the framebuffer layer) in the     fbcon code in the Linux kernel before 5.8.15 could be     used by local attackers to read kernel memory, aka     CID-6735b4632def.(CVE-2020-28915)

  - A flaw in the way reply ICMP packets are limited in the     Linux kernel functionality was found that allows to     quickly scan open UDP ports. This flaw allows an     off-path remote user to effectively bypassing source     port UDP randomization. The highest threat from this     vulnerability is to confidentiality and possibly     integrity, because software that relies on UDP source     port randomization are indirectly affected as well.
    Kernel versions before 5.10 may be vulnerable to this     issue.(CVE-2020-25705)

  - race condition in fg_console can lead to use-after-free     in con_font_op.(CVE-2020-25668)

  - The Linux kernel before version 5.8 is vulnerable to a     NULL pointer dereference in     drivers/tty/serial/8250/8250_core.c:serial8250_isa_init
    _ports() that allows local users to cause a denial of     service by using the p->serial_in pointer which     uninitialized.(CVE-2020-15437)

  - An issue was discovered in the Linux kernel through     5.9.1, as used with Xen through 4.14.x. Guest OS users     can cause a denial of service (host OS hang) via a high     rate of events to dom0, aka     CID-e99502f76271.(CVE-2020-27673)

  - An issue was discovered in __split_huge_pmd in     mm/huge_memory.c in the Linux kernel before 5.7.5. The     copy-on-write implementation can grant unintended write     access because of a race condition in a THP mapcount     check, aka CID-c444eb564fb1.(CVE-2020-29368)

  - An issue was discovered in the Linux kernel through     5.9.1, as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel     removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL     pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized     device, aka CID-073d0552ead5.(CVE-2020-27675)

  - A flaw was found in the way RTAS handled memory     accesses in userspace to kernel communication. On a     locked down (usually due to Secure Boot) guest system     running on top of PowerVM or KVM hypervisors (pseries     platform) a root like local user could use this flaw to     further increase their privileges to that of a running     kernel.(CVE-2020-27777)

  - There is a memory leak in     perf_event_parse_addr_filter.(CVE-2020-25704)

  - Insufficient access control in the Linux kernel driver     for some Intel(R) Processors may allow an authenticated     user to potentially enable information disclosure via     local access.(CVE-2020-8694)

  - A flaw was found in the Linux kernel. A use-after-free     was found in the way the console subsystem was using     ioctls KDGKBSENT and KDSKBSENT. A local user could use     this flaw to get read memory access out of bounds. The     highest threat from this vulnerability is to data     confidentiality.(CVE-2020-25656)

  - In kbd_keycode of keyboard.c, there is a possible out     of bounds write due to a missing bounds check. This     could lead to local escalation of privilege with no     additional execution privileges needed. User     interaction is not needed for exploitation.Product:
    AndroidVersions: Android kernelAndroid ID:
    A-144161459(CVE-2020-0431)

  - A flaw was found in the HDLC_PPP module of the Linux     kernel in versions before 5.9-rc7. Memory corruption     and a read overflow is caused by improper input     validation in the ppp_cp_parse_cr function which can     cause the system to crash or cause a denial of service.
    The highest threat from this vulnerability is to data     confidentiality and integrity as well as system     availability.(CVE-2020-25643)

  - A flaw was found in the Linux kernel in versions before     5.9-rc7. Traffic between two Geneve endpoints may be     unencrypted when IPsec is configured to encrypt traffic     for the specific UDP port used by the GENEVE tunnel     allowing anyone between the two endpoints to read the     traffic unencrypted. The main threat from this     vulnerability is to data     confidentiality.(CVE-2020-25645)

  - An information leak flaw was found in the way the Linux     kernel's Bluetooth stack implementation handled     initialization of stack memory when handling certain     AMP packets. A remote attacker in adjacent range could     use this flaw to leak small portions of stack memory on     the system by sending a specially crafted AMP packets.
    The highest threat from this vulnerability is to data     confidentiality.(CVE-2020-12352)

  - A flaw was found in the way the Linux kernel Bluetooth     implementation handled L2CAP packets with A2MP CID. A     remote attacker in adjacent range could use this flaw     to crash the system causing denial of service or     potentially execute arbitrary code on the system by     sending a specially crafted L2CAP packet. The highest     threat from this vulnerability is to data     confidentiality and integrity as well as system     availability.(CVE-2020-12351)

  - A missing CAP_NET_RAW check in NFC socket creation in     net/nfc/rawsock.c in the Linux kernel before 5.8.2     could be used by local attackers to create raw sockets,     bypassing security mechanisms, aka     CID-26896f01467a.(CVE-2020-26088)

  - A flaw was found in the Linux kernel's implementation     of biovecs in versions before 5.9-rc7. A zero-length     biovec request issued by the block subsystem could     cause the kernel to enter an infinite loop, causing a     denial of service. This flaw allows a local attacker     with basic privileges to issue requests to a block     device, resulting in a denial of service. The highest     threat from this vulnerability is to system     availability.(CVE-2020-25641)

  - In skb_to_mamac of networking.c, there is a possible     out of bounds write due to an integer overflow. This     could lead to local escalation of privilege with no     additional execution privileges needed. User     interaction is not needed for exploitation.Product:
    AndroidVersions: Android kernelAndroid ID:
    A-143560807(CVE-2020-0432)

  - A TOCTOU mismatch in the NFS client code in the Linux     kernel before 5.8.3 could be used by local attackers to     corrupt memory or possibly have unspecified other     impact because a size check is in fs/ nfs/ nfs4proc.c     instead of fs/ nfs/ nfs4xdr.c, aka     CID-b4487b935452..(CVE-2020-25212)

  - A flaw was found in the Linux kernel before 5.9-rc4. A     failure of the file system metadata validator in XFS     can cause an inode with a valid, user-creatable     extended attribute to be flagged as corrupt. This can     lead to the filesystem being shutdown, or otherwise     rendered inaccessible until it is remounted, leading to     a denial of service. The highest threat from this     vulnerability is to system     availability.(CVE-2020-14385)

  - In uvc_scan_chain_forward of uvc_driver.c, there is a     possible linked list corruption due to an unusual root     cause. This could lead to local escalation of privilege     in the kernel with no additional execution privileges     needed. User interaction is not needed for     exploitation.Product: AndroidVersions: Android     kernelAndroid ID: A-111893654References: Upstream     kernel(CVE-2020-0404)

  - The rbd block device driver in drivers/block/rbd.c in     the Linux kernel through 5.8.9 used incomplete     permission checking for access to rbd devices, which     could be leveraged by local attackers to map or unmap     rbd block devices, aka     CID-f44d04e696fe.(CVE-2020-25284)

  - A race condition between hugetlb sysctl handlers in     mm/hugetlb.c in the Linux kernel before 5.8.8 could be     used by local attackers to corrupt memory, cause a NULL     pointer dereference, or possibly have unspecified other     impact, aka CID-17743798d812.(CVE-2020-25285)

  - A memory out-of-bounds read flaw was found in the Linux     kernel before 5.9-rc2 with the ext3/ext4 file system,     in the way it accesses a directory with broken     indexing. This flaw allows a local user to crash the     system if the directory exists. The highest threat from     this vulnerability is to system     availability.(CVE-2020-14314)

  - A flaw was found in the Linux kernel before 5.9-rc4.
    Memory corruption can be exploited to gain root     privileges from unprivileged processes. The highest     threat from this vulnerability is to data     confidentiality and integrity.(CVE-2020-14386)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the kernel packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - In do_epoll_ctl and ep_loop_check_proc of eventpoll.c,     there is a possible use after free due to a logic     error. This could lead to local escalation of privilege     with no additional execution privileges needed. User     interaction is not needed for exploitation.Product:
    AndroidVersions: Android kernelAndroid ID:
    A-147802478References: Upstream kernel(CVE-2020-0466)

  - In the l2tp subsystem, there is a possible use after     free due to a race condition. This could lead to local     escalation of privilege with System execution     privileges needed. User interaction is not needed for     exploitation.Product: AndroidVersions: Android     kernelAndroid ID: A-152409173(CVE-2020-27067)

  - In the nl80211_policy policy of nl80211.c, there is a     possible out of bounds read due to a missing bounds     check. This could lead to local information disclosure     with System execution privileges needed. User     interaction is not required for exploitation.Product:
    AndroidVersions: Android kernelAndroid ID:
    A-119770583(CVE-2020-27068)

  - In audit_free_lsm_field of auditfilter.c, there is a     possible bad kfree due to a logic error in     audit_data_to_entry. This could lead to local     escalation of privilege with no additional execution     privileges needed. User interaction is not needed for     exploitation.Product: AndroidVersions: Android     kernelAndroid ID: A-150693166References: Upstream     kernel(CVE-2020-0444)

  - In various methods of hid-multitouch.c, there is a     possible out of bounds write due to a missing bounds     check. This could lead to local escalation of privilege     with no additional execution privileges needed. User     interaction is not needed for exploitation.Product:
    AndroidVersions: Android kernelAndroid ID:
    A-162844689References: Upstream kernel(CVE-2020-0465)

  - Use-after-free vulnerability in fs/block_dev.c in the     Linux kernel before 5.8 allows local users to gain     privileges or cause a denial of service by leveraging     improper access to a certain error     field.(CVE-2020-15436)

  - The Linux kernel before version 5.8 is vulnerable to a     NULL pointer dereference in     drivers/tty/serial/8250/8250_core.c:serial8250_isa_init
    _ports() that allows local users to cause a denial of     service by using the p->serial_in pointer which     uninitialized.(CVE-2020-15437)

  - A flaw was found in the Linux kernels implementation of     MIDI, where an attacker with a local account and the     permissions to issue an ioctl commands to midi devices,     could trigger a use-after-free. A write to this     specific memory while freed and before use could cause     the flow of execution to change and possibly allow for     memory corruption or privilege     escalation.(CVE-2020-27786)

  - No description is available for this     CVE.(CVE-2020-27815)

  - NULL-ptr deref in the spk_ttyio_receive_buf2() function     in spk_ttyio.c(CVE-2020-27830)

  - An issue was discovered in __split_huge_pmd in     mm/huge_memory.c in the Linux kernel before 5.7.5. The     copy-on-write implementation can grant unintended write     access because of a race condition in a THP mapcount     check, aka CID-c444eb564fb1.(CVE-2020-29368)

  - An issue was discovered in kmem_cache_alloc_bulk in     mm/slub.c in the Linux kernel before 5.5.11. The     slowpath lacks the required TID increment, aka     CID-fd4d9c7d0c71.(CVE-2020-29370)

  - An issue was discovered in romfs_dev_read in     fs/romfs/storage.c in the Linux kernel before 5.8.4.
    Uninitialized memory leaks to userspace, aka     CID-bcf85fcedfdd.(CVE-2020-29371)

  - A locking inconsistency issue was discovered in the tty     subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may     allow a read-after-free attack against TIOCGSID, aka     CID-c8bcd9c5be24.(CVE-2020-29660)

  - A locking issue was discovered in the tty subsystem of     the Linux kernel through 5.9.13.
    drivers/tty/tty_jobctrl.c allows a use-after-free     attack against TIOCSPGRP, aka     CID-54ffccbf053b.(CVE-2020-29661)

  - A slab-out-of-bounds read in fbcon in the Linux kernel     before 5.9.7 could be used by local attackers to read     privileged information or potentially crash the kernel,     aka CID-3c4e0dff2095. This occurs because     KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for     manipulations such as font height.(CVE-2020-28974)

  - An issue was discovered in the Linux kernel through     5.9.1, as used with Xen through 4.14.x. Guest OS users     can cause a denial of service (host OS hang) via a high     rate of events to dom0, aka     CID-e99502f76271.(CVE-2020-27673)

  - An issue was discovered in     drivers/accessibility/speakup/spk_ttyio.c in the Linux     kernel through 5.9.9. Local attackers on systems with     the speakup driver could cause a local denial of     service attack, aka CID-d41227544427. This occurs     because of an invalid free when the line discipline is     used more than once.(CVE-2020-28941)

  - An issue was discovered in the Linux kernel through     5.9.1, as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel     removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL     pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized     device, aka CID-073d0552ead5.(CVE-2020-27675)

  - A buffer over-read (at the framebuffer layer) in the     fbcon code in the Linux kernel before 5.8.15 could be     used by local attackers to read kernel memory, aka     CID-6735b4632def.(CVE-2020-28915)

  - A flaw was found in the Linux kernel. A use-after-free     memory flaw was found in the perf subsystem allowing a     local attacker with permission to monitor perf events     to corrupt memory and possibly escalate privileges. The     highest threat from this vulnerability is to data     confidentiality and integrity as well as system     availability.(CVE-2020-14351)

  - A flaw in the way reply ICMP packets are limited in the     Linux kernel functionality was found that allows to     quickly scan open UDP ports. This flaw allows an     off-path remote user to effectively bypassing source     port UDP randomization. The highest threat from this     vulnerability is to confidentiality and possibly     integrity, because software that relies on UDP source     port randomization are indirectly affected as well.
    Kernel versions before 5.10 may be vulnerable to this     issue.(CVE-2020-25705)

  - No description is available for this     CVE.(CVE-2020-25668)

  - No description is available for this     CVE.(CVE-2020-25669)

  - A flaw was found in the way RTAS handled memory     accesses in userspace to kernel communication. On a     locked down (usually due to Secure Boot) guest system     running on top of PowerVM or KVM hypervisors (pseries     platform) a root like local user could use this flaw to     further increase their privileges to that of a running     kernel.(CVE-2020-27777)

  - kernel: perf_event_parse_addr_filter     memory(CVE-2020-25704)

  - Insufficient access control in the Linux kernel driver     for some Intel(R) Processors may allow an authenticated     user to potentially enable information disclosure via     local access.(CVE-2020-8694)

  - A flaw was found in the Linux kernel. A use-after-free     was found in the way the console subsystem was using     ioctls KDGKBSENT and KDSKBSENT. A local user could use     this flaw to get read memory access out of bounds. The     highest threat from this vulnerability is to data     confidentiality.(CVE-2020-25656)

  - In kbd_keycode of keyboard.c, there is a possible out     of bounds write due to a missing bounds check. This     could lead to local escalation of privilege with no     additional execution privileges needed. User     interaction is not needed for exploitation.Product:
    AndroidVersions: Android kernelAndroid ID:
    A-144161459(CVE-2020-0431)

  - A flaw was found in the HDLC_PPP module of the Linux     kernel in versions before 5.9-rc7. Memory corruption     and a read overflow is caused by improper input     validation in the ppp_cp_parse_cr function which can     cause the system to crash or cause a denial of service.
    The highest threat from this vulnerability is to data     confidentiality and integrity as well as system     availability.(CVE-2020-25643)

  - A flaw was found in the Linux kernel in versions before     5.9-rc7. Traffic between two Geneve endpoints may be     unencrypted when IPsec is configured to encrypt traffic     for the specific UDP port used by the GENEVE tunnel     allowing anyone between the two endpoints to read the     traffic unencrypted. The main threat from this     vulnerability is to data     confidentiality.(CVE-2020-25645)

  - Vulnerability Summary for     CVE-2020-12351(CVE-2020-12351)

  - Vulnerability Summary for     CVE-2020-12352(CVE-2020-12352)

  - Vulnerability Summary for     CVE-2020-24490(CVE-2020-24490)

  - A missing CAP_NET_RAW check in NFC socket creation in     net/nfc/rawsock.c in the Linux kernel before 5.8.2     could be used by local attackers to create raw sockets,     bypassing security mechanisms, aka     CID-26896f01467a.(CVE-2020-26088)

  - A flaw was found in the Linux kernel's implementation     of biovecs in versions before 5.9-rc7. A zero-length     biovec request issued by the block subsystem could     cause the kernel to enter an infinite loop, causing a     denial of service. This flaw allows a local attacker     with basic privileges to issue requests to a block     device, resulting in a denial of service. The highest     threat from this vulnerability is to system     availability.(CVE-2020-25641)

  - In skb_to_mamac of networking.c, there is a possible     out of bounds write due to an integer overflow. This     could lead to local escalation of privilege with no     additional execution privileges needed. User     interaction is not needed for exploitation.Product:
    AndroidVersions: Android kernelAndroid ID:
    A-143560807(CVE-2020-0432)

  - A race condition between hugetlb sysctl handlers in     mm/hugetlb.c in the Linux kernel before 5.8.8 could be     used by local attackers to corrupt memory, cause a NULL     pointer dereference, or possibly have unspecified other     impact, aka CID-17743798d812.(CVE-2020-25285)

  - A flaw was found in the Linux kernel in versions from     2.2.3 through 5.9.rc5. When changing screen size, an     out-of-bounds memory write can occur leading to memory     corruption or a denial of service. This highest threat     from this vulnerability is to system     availability.(CVE-2020-14390)

  - A flaw was found in the Linux kernel before 5.9-rc4.
    Memory corruption can be exploited to gain root     privileges from unprivileged processes. The highest     threat from this vulnerability is to data     confidentiality and integrity.(CVE-2020-14386)

  - Insufficient input validation in i40e driver for     Intel(R) Ethernet 700 Series Controllers versions     before 7.0 may allow an authenticated user to     potentially enable a denial of service via local     access.(CVE-2019-0147)

  - A TOCTOU mismatch in the NFS client code in the Linux     kernel before 5.8.3 could be used by local attackers to     corrupt memory or possibly have unspecified other     impact because a size check is in fs/nfs/nfs4proc.c     instead of fs/nfs/nfs4xdr.c, aka     CID-b4487b935452.(CVE-2020-25212)

  - A flaw was found in the Linux kernel before 5.9-rc4. A     failure of the file system metadata validator in XFS     can cause an inode with a valid, user-creatable     extended attribute to be flagged as corrupt. This can     lead to the filesystem being shutdown, or otherwise     rendered inaccessible until it is remounted, leading to     a denial of service. The highest threat from this     vulnerability is to system     availability.(CVE-2020-14385)

  - In uvc_scan_chain_forward of uvc_driver.c, there is a     possible linked list corruption due to an unusual root     cause. This could lead to local escalation of privilege     in the kernel with no additional execution privileges     needed. User interaction is not needed for     exploitation.Product: AndroidVersions: Android     kernelAndroid ID: A-111893654References: Upstream     kernel(CVE-2020-0404)

  - The rbd block device driver in drivers/block/rbd.c in     the Linux kernel through 5.8.9 used incomplete     permission checking for access to rbd devices, which     could be leveraged by local attackers to map or unmap     rbd block devices, aka     CID-f44d04e696fe.(CVE-2020-25284)

  - A memory out-of-bounds read flaw was found in the Linux     kernel before 5.9-rc2 with the ext3/ext4 file system,     in the way it accesses a directory with broken     indexing. This flaw allows a local user to crash the     system if the directory exists. The highest threat from     this vulnerability is to system     availability.(CVE-2020-14314)

  - A flaw null pointer dereference in the Linux kernel     cgroupv2 subsystem in versions before 5.7.10 was found     in the way when reboot the system. A local user could     use this flaw to crash the system or escalate their     privileges on the system.(CVE-2020-24394)

  - A flaw was found in the Linux kernel's implementation     of the invert video code on VGA consoles when a local     attacker attempts to resize the console, calling an     ioctl VT_RESIZE, which causes an out-of-bounds write to     occur. This flaw allows a local user with access to the     VGA console to crash the system, potentially escalating     their privileges on the system. The highest threat from     this vulnerability is to data confidentiality and     integrity as well as system     availability.(CVE-2020-14331)

  - The Linux kernel, as used in Red Hat Enterprise Linux     7, kernel-rt, and Enterprise MRG 2 and when booted with     UEFI Secure Boot enabled, allows local users to bypass     intended securelevel/secureboot restrictions by     leveraging improper handling of secure_boot flag across     kexec reboot.(CVE-2015-7837)

  - In the Linux kernel through 5.8.7, local attackers able     to inject conntrack netlink configuration could     overflow a local buffer, causing crashes or triggering     use of incorrect protocol numbers in     ctnetlink_parse_tuple_filter in     net/netfilter/nf_conntrack_netlink.c, aka     CID-1cc5ef91d2ff.(CVE-2020-25211)

  - A flaw null pointer dereference in the Linux kernel     cgroupv2 subsystem in versions before 5.7.10 was found     in the way when reboot the system. A local user could     use this flaw to crash the system or escalate their     privileges on the system.(CVE-2020-14356)

  - Buffer overflow in i40e driver for Intel(R) Ethernet     700 Series Controllers versions before 7.0 may allow an     authenticated user to potentially enable an escalation     of privilege via local access.(CVE-2019-0145)

  - The Linux kernel through 5.7.11 allows remote attackers     to make observations that help to obtain sensitive     information about the internal state of the network     RNG, aka CID-f227e3ec3b5c. This is related to     drivers/char/random.c and     kernel/time/timer.c.(CVE-2020-16166)

  - The VFIO PCI driver in the Linux kernel through 5.6.13     mishandles attempts to access disabled memory     space.(CVE-2020-12888)

  - In the Linux kernel through 5.7.6, usbtest_disconnect     in drivers/usb/misc/usbtest.c has a memory leak, aka     CID-28ebeb8db770.(CVE-2020-15393)

  - A logic bug was found in the Linux kernels     implementation of SSBD. A bug in the logic handling can     allow an attacker with a local account to disable SSBD     protection during a context switch when additional     speculative execution mitigations are in     place.(CVE-2020-10766)

  - The prctl() function can be used to enable indirect     branch speculation even after it has been disabled.
    This same call will incorrectly report it being 'force     disabled' when it is not.(CVE-2020-10768)

  - A flaw was found in the Linux kernel's implementation     of the Enhanced IBPB (Indirect Branch Prediction     Barrier). The IBPB mitigation will be disabled when     STIBP is not available or when the Enhanced Indirect     Branch Restricted Speculation (IBRS) is available. This     flaw allows a local attacker to perform a Spectre V2     style attack when this configuration is active. The     highest threat from this vulnerability is to     confidentiality.(CVE-2020-10767)

  - A flaw was found in the ZRAM kernel module, where a     user with a local account and the ability to read the     /sys/class/zram-control/hot_add file can create ZRAM     device nodes in the /dev/ directory. This read     allocates kernel memory and is not accounted for a user     that triggers the creation of that ZRAM device. With     this vulnerability, continually reading the device may     consume a large amount of system memory and cause the     Out-of-Memory (OOM) killer to activate and terminate     random userspace processes, possibly making the system     inoperable.(CVE-2020-10781)

  - A flaw was found in the Linux kernel. An index buffer     overflow during Direct IO write leading to the NFS     client to crash. In some cases, a reach out of the     index after one memory allocation by kmalloc will cause     a kernel panic. The highest threat from this     vulnerability is to data confidentiality and system     availability.(CVE-2020-10742)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update syncs the RT kernel from the SUSE Linux Enterprise 15-SP2 codestream. This update was imported from the SUSE:SLE-15-SP2:Update update project.

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - In drivers/target/target_core_xcopy.c in the Linux     kernel before 5.10.7, insufficient identifier checking     in the LIO SCSI target code can be used by remote     attackers to read or write files via directory     traversal in an XCOPY request, aka CID-2896c93811e3.
    For example, an attack can occur over a network if the     attacker has access to one iSCSI LUN. The attacker     gains control over file access because I/O operations     are proxied via an attacker-selected     backstore.(CVE-2020-28374)

  - In create_pinctrl of core.c, there is a possible out of     bounds read due to a use after free. This could lead to     local information disclosure with no additional     execution privileges needed. User interaction is not     needed for exploitation.(CVE-2020-0427)

  - mwifiex_cmd_802_11_ad_hoc_start in     drivers/net/wireless/marvell/mwifiex/join.c in the     Linux kernel through 5.10.4 might allow remote     attackers to execute arbitrary code via a long SSID     value, aka CID-5c455c5ab332.(CVE-2020-36158)

  - A locking issue was discovered in the tty subsystem of     the Linux kernel through 5.9.13.
    drivers/tty/tty_jobctrl.c allows a use-after-free     attack against TIOCSPGRP, aka     CID-54ffccbf053b.(CVE-2020-29661)

  - A locking inconsistency issue was discovered in the tty     subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may     allow a read-after-free attack against TIOCGSID, aka     CID-c8bcd9c5be24.(CVE-2020-29660)

  - An issue was discovered in     drivers/accessibility/speakup/spk_ttyio.c in the Linux     kernel through 5.9.9. Local attackers on systems with     the speakup driver could cause a local denial of     service attack, aka CID-d41227544427. This occurs     because of an invalid free when the line discipline is     used more than once.(CVE-2020-28941)

  - NULL-ptr deref in the spk_ttyio_receive_buf2() function     in spk_ttyio.c.(CVE-2020-27830)

  - In various methods of hid-multitouch.c, there is a     possible out of bounds write due to a missing bounds     check. This could lead to local escalation of privilege     with no additional execution privileges needed. User     interaction is not needed for     exploitation.(CVE-2020-0465)

  - A flaw was found in the Linux kernels implementation of     MIDI, where an attacker with a local account and the     permissions to issue an ioctl commands to midi devices,     could trigger a use-after-free. A write to this     specific memory while freed and before use could cause     the flow of execution to change and possibly allow for     memory corruption or privilege     escalation.(CVE-2020-27786)

  - In the nl80211_policy policy of nl80211.c, there is a     possible out of bounds read due to a missing bounds     check. This could lead to local information disclosure     with System execution privileges needed. User     interaction is not required for     exploitation.(CVE-2020-27068)

  - A locking issue was discovered in the tty subsystem of     the Linux kernel through 5.9.13.
    drivers/tty/tty_jobctrl.c allows a use-after-free     attack against TIOCSPGRP, aka     CID-54ffccbf053b.(CVE-2020-29661)

  - Array index out of bounds access when setting extended     attributes on journaling filesystems.(CVE-2020-27815)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of kernel installed on the remote host is prior to 4.14.209-117.337. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2021-1461 advisory.

  - ** DISPUTED ** In the Linux kernel 4.19.83, there is a use-after-free (read) in the debugfs_remove     function in fs/debugfs/inode.c (which is used to remove a file or directory in debugfs that was previously     created with a call to another debugfs function such as debugfs_create_file). NOTE: Linux kernel     developers dispute this issue as not being an issue with debugfs, instead this is an issue with misuse of     debugfs within blktrace. (CVE-2019-19770)

  - A flaw was found in the Linux kernel. A use-after-free memory flaw was found in the perf subsystem     allowing a local attacker with permission to monitor perf events to corrupt memory and possibly escalate     privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as     system availability. (CVE-2020-14351)

  - A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was     using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of     bounds. The highest threat from this vulnerability is to data confidentiality. (CVE-2020-25656)

  - A flaw memory leak in the Linux kernel performance monitoring subsystem was found in the way if using     PERF_EVENT_IOC_SET_FILTER. A local user could use this flaw to starve the resources causing denial of     service. (CVE-2020-25704)

  - An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users     can cause a denial of service (host OS hang) via a high rate of events to dom0, aka CID-e99502f76271.
    (CVE-2020-27673)

  - An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5. (CVE-2020-27675)

  - A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked     down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries     platform) a root like local user could use this flaw to further increase their privileges to that of a     running kernel. (CVE-2020-27777)

  - An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9.
    Local attackers on systems with the speakup driver could cause a local denial of service attack, aka     CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
    (CVE-2020-28941)

  - A slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to     read privileged information or potentially crash the kernel, aka CID-3c4e0dff2095. This occurs because     KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for manipulations such as font height. (CVE-2020-28974)

  - Insufficient access control in the Linux kernel driver for some Intel(R) Processors may allow an     authenticated user to potentially enable information disclosure via local access. (CVE-2020-8694)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - The kernel package contains the Linux kernel (vmlinuz),     the core of any Linux operating system. The kernel     handles the basic functions of the operating system:
    memory allocation, process allocation, device input and     output, etc.Security Fix(es):In do_epoll_ctl and     ep_loop_check_proc of eventpoll.c, there is a possible     use after free due to a logic error. This could lead to     local escalation of privilege with no additional     execution privileges needed.(CVE-2020-0466)In the l2tp     subsystem, there is a possible use after free due to a     race condition. This could lead to local escalation of     privilege with System execution privileges     needed.(CVE-2020-27067)In the nl80211_policy policy of     nl80211.c, there is a possible out of bounds read due     to a missing bounds check. This could lead to local     information disclosure with System execution privileges     needed.(CVE-2020-27068)In audit_free_lsm_field of     auditfilter.c, there is a possible bad kfree due to a     logic error in audit_data_to_entry. This could lead to     local escalation of privilege with no additional     execution privileges needed.(CVE-2020-0444)In various     methods of hid-multitouch.c, there is a possible out of     bounds write due to a missing bounds check. This could     lead to local escalation of privilege with no     additional execution privileges     needed.(CVE-2020-0465)Use-after-free vulnerability in     fs/block_dev.c in the Linux kernel before 5.8 allows     local users to gain privileges or cause a denial of     service by leveraging improper access to a certain     error field.(CVE-2020-15436)The Linux kernel before     version 5.8 is vulnerable to a NULL pointer dereference     in     drivers/tty/serial/8250/8250_core.c:serial8250_isa_init
    _ports() that allows local users to cause a denial of     service by using the p->serial_in pointer which     uninitialized.(CVE-2020-15437)A flaw was found in the     Linux kernels implementation of MIDI, where an attacker     with a local account and the permissions to issue an     ioctl commands to midi devices, could trigger a     use-after-free. A write to this specific memory while     freed and before use could cause the flow of execution     to change and possibly allow for memory corruption or     privilege escalation.(CVE-2020-27786)Array index out of     bounds access when setting extended attributes on     journaling filesystems.(CVE-2020-27815)NULL-ptr deref     in the spk_ttyio_receive_buf2() function in     spk_ttyio.c(CVE-2020-27830)An issue was discovered in
    __split_huge_pmd in mm/huge_memory.c in the Linux     kernel before 5.7.5. The copy-on-write implementation     can grant unintended write access because of a race     condition in a THP mapcount check, aka     CID-c444eb564fb1.(CVE-2020-29368)An issue was     discovered in kmem_cache_alloc_bulk in mm/slub.c in the     Linux kernel before 5.5.11. The slowpath lacks the     required TID increment, aka     CID-fd4d9c7d0c71.(CVE-2020-29370)An issue was     discovered in romfs_dev_read in fs/romfs/storage.c in     the Linux kernel before 5.8.4. Uninitialized memory     leaks to userspace, aka     CID-bcf85fcedfdd.(CVE-2020-29371)A locking     inconsistency issue was discovered in the tty subsystem     of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may     allow a read-after-free attack against TIOCGSID, aka     CID-c8bcd9c5be24.(CVE-2020-29660)A locking issue was     discovered in the tty subsystem of the Linux kernel     through 5.9.13. drivers/tty/tty_jobctrl.c allows a     use-after-free attack against TIOCSPGRP, aka     CID-54ffccbf053b.(CVE-2020-29661)A slab-out-of-bounds     read in fbcon in the Linux kernel before 5.9.7 could be     used by local attackers to read privileged information     or potentially crash the kernel, aka CID-3c4e0dff2095.
    This occurs because KD_FONT_OP_COPY in     drivers/tty/vt/vt.c can be used for manipulations such     as font height.(CVE-2020-28974) An issue was discovered     in the Linux kernel through 5.9.1, as used with Xen     through 4.14.x. Guest OS users can cause a denial of     service (host OS hang) via a high rate of events to     dom0, aka CID-e99502f76271.(CVE-2020-27673)An issue was     discovered in drivers/accessibility/speakup/spk_ttyio.c     in the Linux kernel through 5.9.9. Local attackers on     systems with the speakup driver could cause a local     denial of service attack, aka CID-d41227544427. This     occurs because of an invalid free when the line     discipline is used more than once.(CVE-2020-28941)An     issue was discovered in the Linux kernel through 5.9.1,     as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel     removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL     pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized     device, aka CID-073d0552ead5.(CVE-2020-27675)A buffer     over-read (at the framebuffer layer) in the fbcon code     in the Linux kernel before 5.8.15 could be used by     local attackers to read kernel memory, aka     CID-6735b4632def.(CVE-2020-28915)A flaw was found in     the Linux kernel. A use-after-free memory flaw was     found in the perf subsystem allowing a local attacker     with permission to monitor perf events to corrupt     memory and possibly escalate privileges. The highest     threat from this vulnerability is to data     confidentiality and integrity as well as system     availability.(CVE-2020-14351)A flaw in the way reply     ICMP packets are limited in the Linux kernel     functionality was found that allows to quickly scan     open UDP ports. This flaw allows an off-path remote     user to effectively bypassing source port UDP     randomization. The highest threat from this     vulnerability is to confidentiality and possibly     integrity, because software that relies on UDP source     port randomization are indirectly affected as well.
    Kernel versions before 5.10 may be vulnerable to this     issue.(CVE-2020-25705)race condition in fg_console can     lead to use-after-free in     con_font_op.(CVE-2020-25668)use-after-free read in     sunkbd_reinit in     drivers/input/keyboard/sunkbd.c.(CVE-2020-25669)A flaw     was found in the way RTAS handled memory accesses in     userspace to kernel communication. On a locked down     (usually due to Secure Boot) guest system running on     top of PowerVM or KVM hypervisors (pseries platform) a     root like local user could use this flaw to further     increase their privileges to that of a running     kernel.(CVE-2020-27777)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - The kernel package contains the Linux kernel (vmlinuz),     the core of any Linux operating system. The kernel     handles the basic functions of the operating system:
    memory allocation, process allocation, device input and     output, etc.Security Fix(es):In create_pinctrl of     core.c, there is a possible out of bounds read due to a     use after free. This could lead to local information     disclosure with no additional execution privileges     needed.(CVE-2020-0427)NULL-ptr deref in the     spk_ttyio_receive_buf2() function in     spk_ttyio.c.(CVE-2020-27830)In do_epoll_ctl and     ep_loop_check_proc of eventpoll.c, there is a possible     use after free due to a logic error. This could lead to     local escalation of privilege with no additional     execution privileges needed.(CVE-2020-0466)In the     nl80211_policy policy of nl80211.c, there is a possible     out of bounds read due to a missing bounds check. This     could lead to local information disclosure with System     execution privileges     needed.(CVE-2020-27068)use-after-free read in     sunkbd_reinit in     drivers/input/keyboard/sunkbd.c.(CVE-2020-25669)A flaw     was found in the Linux kernels implementation of MIDI,     where an attacker with a local account and the     permissions to issue an ioctl commands to midi devices,     could trigger a use-after-free. A write to this     specific memory while freed and before use could cause     the flow of execution to change and possibly allow for     memory corruption or privilege     escalation.(CVE-2020-27786)An issue was discovered in     romfs_dev_read in fs/romfs/storage.c in the Linux     kernel before 5.8.4. Uninitialized memory leaks to     userspace, aka CID-bcf85fcedfdd.(CVE-2020-29371)A     slab-out-of-bounds read in fbcon in the Linux kernel     before 5.9.7 could be used by local attackers to read     privileged information or potentially crash the kernel,     aka CID-3c4e0dff2095. This occurs because     KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for     manipulations such as font height.(CVE-2020-28974)A     locking inconsistency issue was discovered in the tty     subsystem of the Linux kernel through 5.9.13.
    drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may     allow a read-after-free attack against TIOCGSID, aka     CID-c8bcd9c5be24.(CVE-2020-29660)A locking issue was     discovered in the tty subsystem of the Linux kernel     through 5.9.13. drivers/tty/tty_jobctrl.c allows a     use-after-free attack against TIOCSPGRP, aka     CID-54ffccbf053b.(CVE-2020-29661)An issue was     discovered in drivers/accessibility/speakup/spk_ttyio.c     in the Linux kernel through 5.9.9. Local attackers on     systems with the speakup driver could cause a local     denial of service attack, aka CID-d41227544427. This     occurs because of an invalid free when the line     discipline is used more than once.(CVE-2020-28941)A     buffer over-read (at the framebuffer layer) in the     fbcon code in the Linux kernel before 5.8.15 could be     used by local attackers to read kernel memory, aka     CID-6735b4632def.(CVE-2020-28915)A flaw in the way     reply ICMP packets are limited in the Linux kernel     functionality was found that allows to quickly scan     open UDP ports. This flaw allows an off-path remote     user to effectively bypassing source port UDP     randomization. The highest threat from this     vulnerability is to confidentiality and possibly     integrity, because software that relies on UDP source     port randomization are indirectly affected as well.
    Kernel versions before 5.10 may be vulnerable to this     issue.(CVE-2020-25705)race condition in fg_console can     lead to use-after-free in     con_font_op.(CVE-2020-25668)The Linux kernel before     version 5.8 is vulnerable to a NULL pointer dereference     in     drivers/tty/serial/8250/8250_core.c:serial8250_isa_init
    _ports() that allows local users to cause a denial of     service by using the p->serial_in pointer which     uninitialized.(CVE-2020-15437)An issue was discovered     in the Linux kernel through 5.9.1, as used with Xen     through 4.14.x. Guest OS users can cause a denial of     service (host OS hang) via a high rate of events to     dom0, aka CID-e99502f76271.(CVE-2020-27673)An issue was     discovered in __split_huge_pmd in mm/huge_memory.c in     the Linux kernel before 5.7.5. The copy-on-write     implementation can grant unintended write access     because of a race condition in a THP mapcount check,     aka CID-c444eb564fb1.(CVE-2020-29368)An issue was     discovered in the Linux kernel through 5.9.1, as used     with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel     removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL     pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized     device, aka CID-073d0552ead5.(CVE-2020-27675)A flaw was     found in the way RTAS handled memory accesses in     userspace to kernel communication. On a locked down     (usually due to Secure Boot) guest system running on     top of PowerVM or KVM hypervisors (pseries platform) a     root like local user could use this flaw to further     increase their privileges to that of a running     kernel.(CVE-2020-27777)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The SUSE Linux Enterprise 15 SP2 RT kernel was updated to receive various security and bugfixes.

The following security bugs were fixed :

CVE-2020-15436: Fixed a use after free vulnerability in fs/block_dev.c which could have allowed local users to gain privileges or cause a denial of service (bsc#1179141).

CVE-2020-15437: Fixed a NULL pointer dereference which could have allowed local users to cause a denial of service(bsc#1179140).

CVE-2020-25669: Fixed a use-after-free read in sunkbd_reinit() (bsc#1178182).

CVE-2020-25705: Fixed A flaw in the way reply ICMP packets are limited in was found that allowed to quickly scan open UDP ports. This flaw allowed an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software and services that rely on UDP source port randomization (like DNS) are indirectly affected as well. Kernel versions may be vulnerable to this issue (bsc#1175721, bsc#1178782).

CVE-2020-27777: Restrict RTAS requests from userspace (bsc#1179107)

CVE-2020-27786: Fixed a use after free in kernel midi subsystem snd_rawmidi_kernel_read1() (bsc#1179601).

CVE-2020-28915: Fixed a buffer over-read in the fbcon code which could have been used by local attackers to read kernel memory (bsc#1178886).

CVE-2020-28941: Fixed an issue where local attackers on systems with the speakup driver could cause a local denial of service attack (bsc#1178740).

CVE-2020-29369: Fixed a race condition between certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an munmap call, aka CID-246c320a8cfe (bnc#1173504 bsc#1179432).

CVE-2020-29371: Fixed uninitialized memory leaks to userspace (bsc#1179429).

CVE-2020-4788: Fixed an issue with IBM Power9 processors could have allowed a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances (bsc#1177666).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The SUSE Linux Enterprise 15 SP2 kernel was updated to 3.12.31 to receive various security and bugfixes.

The following security bugs were fixed :

CVE-2020-15436: Fixed a use after free vulnerability in fs/block_dev.c which could have allowed local users to gain privileges or cause a denial of service (bsc#1179141).

CVE-2020-15437: Fixed a NULL pointer dereference which could have allowed local users to cause a denial of service(bsc#1179140).

CVE-2020-25668: Fixed a concurrency use-after-free in con_font_op (bsc#1178123).

CVE-2020-25669: Fixed a use-after-free read in sunkbd_reinit() (bsc#1178182).

CVE-2020-25704: Fixed a leak in perf_event_parse_addr_filter() (bsc#1178393).

CVE-2020-27777: Restrict RTAS requests from userspace (bsc#1179107)

CVE-2020-28915: Fixed a buffer over-read in the fbcon code which could have been used by local attackers to read kernel memory (bsc#1178886).

CVE-2020-28974: Fixed a slab-out-of-bounds read in fbcon which could have been used by local attackers to read privileged information or potentially crash the kernel (bsc#1178589).

CVE-2020-29371: Fixed uninitialized memory leaks to userspace (bsc#1179429).

CVE-2020-25705: Fixed an issue which could have allowed to quickly scan open UDP ports. This flaw allowed an off-path remote user to effectively bypassing source port UDP randomization (bsc#1175721).

CVE-2020-28941: Fixed an issue where local attackers on systems with the speakup driver could cause a local denial of service attack (bsc#1178740).

CVE-2020-4788: Fixed an issue with IBM Power9 processors could have allowed a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances (bsc#1177666).

CVE-2020-29369: Fixed a race condition between certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an munmap call, aka CID-246c320a8cfe (bnc#1173504 1179432).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities have been discovered in the Linux kernel that may lead to the execution of arbitrary code, privilege escalation, denial of service or information leaks.

CVE-2019-19039

'Team bobfuzzer' reported a bug in Btrfs that could lead to an assertion failure (WARN). A user permitted to mount and access arbitrary filesystems could use this to cause a denial of service (crash) if the panic_on_warn kernel parameter is set.

CVE-2019-19377

'Team bobfuzzer' reported a bug in Btrfs that could lead to a use-after-free. A user permitted to mount and access arbitrary filesystems could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2019-19770

The syzbot tool discovered a race condition in the block I/O tracer (blktrace) that could lead to a system crash. Since blktrace can only be controlled by privileged users, the security impact of this is unclear.

CVE-2019-19816

'Team bobfuzzer' reported a bug in Btrfs that could lead to an out-of-bounds write. A user permitted to mount and access arbitrary filesystems could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-0423

A race condition was discovered in the Android binder driver, that could result in a use-after-free. On systems using this driver, a local user could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-8694

Multiple researchers discovered that the powercap subsystem allowed all users to read CPU energy meters, by default. On systems using Intel CPUs, this provided a side channel that could leak sensitive information between user processes, or from the kernel to user processes. The energy meters are now readable only by root, by default.

This issue can be mitigated by running :

chmod go-r /sys/devices/virtual/powercap/*/*/energy_uj

This needs to be repeated each time the system is booted with an unfixed kernel version.

CVE-2020-14351

A race condition was discovered in the performance events subsystem, which could lead to a use-after-free. A local user permitted to access performance events could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

Debian's kernel configuration does not allow unprivileged users to access peformance events by default, which fully mitigates this issue.

CVE-2020-25656

Yuan Ming and Bodong Zhao discovered a race condition in the virtual terminal (vt) driver that could lead to a use-after-free. A local user with the CAP_SYS_TTY_CONFIG capability could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-25668

Yuan Ming and Bodong Zhao discovered a race condition in the virtual terminal (vt) driver that could lead to a use-after-free. A local user with access to a virtual terminal, or with the CAP_SYS_TTY_CONFIG capability, could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-25669

Bodong Zhao discovered a bug in the Sun keyboard driver (sunkbd) that could lead to a use-after-free. On a system using this driver, a local user could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation.

CVE-2020-25704

kiyin(&#x5C39;&#x4EAE;) discovered a potential memory leak in the performance events subsystem. A local user permitted to access performance events could use this to cause a denial of service (memory exhaustion).

Debian's kernel configuration does not allow unprivileged users to access peformance events by default, which fully mitigates this issue.

CVE-2020-25705

Keyu Man reported that strict rate-limiting of ICMP packet transmission provided a side-channel that could help networked attackers to carry out packet spoofing. In particular, this made it practical for off-path networked attackers to 'poison' DNS caches with spoofed responses ('SAD DNS' attack).

This issue has been mitigated by randomising whether packets are counted against the rate limit.

CVE-2020-27673 / XSA-332

Julien Grall from Arm discovered a bug in the Xen event handling code.
Where Linux was used in a Xen dom0, unprivileged (domU) guests could cause a denial of service (excessive CPU usage or hang) in dom0.

CVE-2020-27675 / XSA-331

Jinoh Kang of Theori discovered a race condition in the Xen event handling code. Where Linux was used in a Xen dom0, unprivileged (domU) guests could cause a denial of service (crash) in dom0.

CVE-2020-28941

Shisong Qin and Bodong Zhao discovered a bug in the Speakup screen reader subsystem. Speakup assumed that it would only be bound to one terminal (tty) device at a time, but did not enforce this. A local user could exploit this bug to cause a denial of service (crash or memory exhaustion).

CVE-2020-28974

Yuan Ming discovered a bug in the virtual terminal (vt) driver that could lead to an out-of-bounds read. A local user with access to a virtual terminal, or with the CAP_SYS_TTY_CONFIG capability, could possibly use this to obtain sensitive information from the kernel or to cause a denial of service (crash).

The specific ioctl operation affected by this bug (KD_FONT_OP_COPY) has been disabled, as it is not believed that any programs depended on it.

For Debian 9 stretch, these problems have been fixed in version 4.19.160-2~deb9u1.

We recommend that you upgrade your linux-4.19 packages.

For the detailed security status of linux-4.19 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/linux-4.19

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1566 advisory.

  - ** DISPUTED ** In the Linux kernel 4.19.83, there is a use-after-free (read) in the debugfs_remove     function in fs/debugfs/inode.c (which is used to remove a file or directory in debugfs that was previously     created with a call to another debugfs function such as debugfs_create_file). NOTE: Linux kernel     developers dispute this issue as not being an issue with debugfs, instead this is an issue with misuse of     debugfs within blktrace. (CVE-2019-19770)

  - A flaw was found in the Linux kernel. A use-after-free memory flaw was found in the perf subsystem     allowing a local attacker with permission to monitor perf events to corrupt memory and possibly escalate     privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as     system availability. (CVE-2020-14351)

  - A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was     using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of     bounds. The highest threat from this vulnerability is to data confidentiality. (CVE-2020-25656)

  - A flaw memory leak in the Linux kernel performance monitoring subsystem was found in the way if using     PERF_EVENT_IOC_SET_FILTER. A local user could use this flaw to starve the resources causing denial of     service. (CVE-2020-25704)

  - An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users     can cause a denial of service (host OS hang) via a high rate of events to dom0, aka CID-e99502f76271.
    (CVE-2020-27673)

  - An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x.
    drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race     condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash     via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5. (CVE-2020-27675)

  - An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9.
    Local attackers on systems with the speakup driver could cause a local denial of service attack, aka     CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
    (CVE-2020-28941)

  - A slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to     read privileged information or potentially crash the kernel, aka CID-3c4e0dff2095. This occurs because     KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for manipulations such as font height. (CVE-2020-28974)

  - Insufficient access control in the Linux kernel driver for some Intel(R) Processors may allow an     authenticated user to potentially enable information disclosure via local access. (CVE-2020-8694)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The 5.9.10 stable kernel update contains a number of important fixes across the tree.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
151307	EulerOS Virtualization for ARM 64 3.0.2.0 : kernel (EulerOS-SA-2021-2075)	Nessus	Huawei Local Security Checks	high
148009	Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4750-1)	Nessus	Ubuntu Local Security Checks	high
147983	Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4749-1)	Nessus	Ubuntu Local Security Checks	high
147978	Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-4751-1)	Nessus	Ubuntu Local Security Checks	high
147690	EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-1642)	Nessus	Huawei Local Security Checks	critical
147512	EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-1604)	Nessus	Huawei Local Security Checks	critical
146282	openSUSE Security Update : RT kernel (openSUSE-2021-242)	Nessus	SuSE Local Security Checks	critical
145726	EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-1148)	Nessus	Huawei Local Security Checks	critical
145005	Amazon Linux AMI : kernel (ALAS-2021-1461)	Nessus	Amazon Linux Local Security Checks	high
144693	EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1028)	Nessus	Huawei Local Security Checks	critical
144687	EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1009)	Nessus	Huawei Local Security Checks	critical
144313	openSUSE Security Update : the Linux Kernel (openSUSE-2020-2260)	Nessus	SuSE Local Security Checks	high
144143	SUSE SLES15 Security Update : kernel (SUSE-SU-2020:3764-1)	Nessus	SuSE Local Security Checks	high
144101	SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2020:3748-1)	Nessus	SuSE Local Security Checks	high
144097	Debian DLA-2483-1 : linux-4.19 security update	Nessus	Debian Local Security Checks	high
143589	Amazon Linux 2 : kernel (ALAS-2020-1566)	Nessus	Amazon Linux Local Security Checks	high
143523	openSUSE Security Update : the Linux Kernel (openSUSE-2020-2161)	Nessus	SuSE Local Security Checks	high
143261	Fedora 32 : kernel (2020-4700a73bd5)	Nessus	Fedora Local Security Checks	medium
143258	Fedora 33 : kernel (2020-8c15928d23)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2020-28941

medium

Tenable Plugins

high

high

high

high

critical

critical

critical

critical

high

critical

critical

high

high

high

high

high

high

medium

medium