The 4.20.12 stable 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.

Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-19824)

Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information leak in the Bluetooth implementation of the Linux kernel.
An attacker within Bluetooth range could use this to expose sensitive information (kernel memory). (CVE-2019-3459, CVE-2019-3460)

Jann Horn discovered that the KVM implementation in the Linux kernel contained a use-after-free vulnerability. An attacker in a guest VM with access to /dev/kvm could use this to cause a denial of service (guest VM crash). (CVE-2019-6974)

Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in the KVM subsystem of the Linux kernel, when using nested virtual machines. A local attacker in a guest VM could use this to cause a denial of service (system crash) or possibly execute arbitrary code in the host system. (CVE-2019-7221)

Felix Wilhelm discovered that an information leak vulnerability existed in the KVM subsystem of the Linux kernel, when nested virtualization is used. A local attacker could use this to expose sensitive information (host system memory to a guest VM).
(CVE-2019-7222)

Jann Horn discovered that the eBPF implementation in the Linux kernel was insufficiently hardened against Spectre V1 attacks. A local attacker could use this to expose sensitive information.
(CVE-2019-7308)

It was discovered that a use-after-free vulnerability existed in the user- space API for crypto (af_alg) implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-8912)

Jakub Jirasek discovered a use-after-free vulnerability in the SCTP implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-8956)

It was discovered that the Linux kernel did not properly deallocate memory when handling certain errors while reading files. A local attacker could use this to cause a denial of service (excessive memory consumption). (CVE-2019-8980)

It was discovered that a use-after-free vulnerability existed in the IPMI implementation in the Linux kernel. A local attacker with access to the IPMI character device files could use this to cause a denial of service (system crash). (CVE-2019-9003)

Jann Horn discovered that the SNMP NAT implementation in the Linux kernel performed insufficient ASN.1 length checks. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-9162)

Jann Horn discovered that the mmap implementation in the Linux kernel did not properly check for the mmap minimum address in some situations. A local attacker could use this to assist exploiting a kernel NULL pointer dereference vulnerability. (CVE-2019-9213).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu 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 for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - A flaw was found in the way the Linux kernel's perf     subsystem retrieved userlevel stack traces on PowerPC     systems. A local, unprivileged user could use this flaw     to cause a denial of service on the system by creating     a special stack layout that would force the     perf_callchain_user_64() function into an infinite     loop.(CVE-2015-6526i1/4%0

  - A vulnerability was found in the Linux kernel. Payloads     of NM entries are not supposed to contain NUL. When     such entry is processed, only the part prior to the     first NUL goes into the concatenation (i.e. the     directory entry name being encoded by a bunch of NM     entries). The process stops when the amount collected     so far + the claimed amount in the current NM entry     exceed 254. However, the value returned as the total     length is the sum of *claimed* sizes, not the actual     amount collected. And that's what will be passed to     readdir() callback as the name length - 8Kb
    __copy_to_user() from a buffer allocated by
    __get_free_page().(CVE-2016-4913i1/4%0

  - The perf_trace_event_perm function in     kernel/trace/trace_event_perf.c in the Linux kernel     before 3.12.2 does not properly restrict access to the     perf subsystem, which allows local users to enable     function tracing via a crafted     application.(CVE-2013-2930i1/4%0

  - The mincore() implementation in mm/mincore.c in the     Linux kernel through 4.19.13 allowed local attackers to     observe page cache access patterns of other processes     on the same system, potentially allowing sniffing of     secret information. (Fixing this affects the output of     the fincore program.) Limited remote exploitation may     be possible, as demonstrated by latency differences in     accessing public files from an Apache HTTP     Server.(CVE-2019-5489i1/4%0

  - It was found that the espfix functionality could be     bypassed by installing a 16-bit RW data segment into     GDT instead of LDT (which espfix checks), and using     that segment on the stack. A local, unprivileged user     could potentially use this flaw to leak kernel stack     addresses.(CVE-2014-8133i1/4%0

  - An issue was discovered in the btrfs filesystem code in     the Linux kernel. An out-of-bounds access is possible     in write_extent_buffer() when mounting and operating a     crafted btrfs image due to a lack of verification at     mount time within the btrfs_read_block_groups() in     fs/btrfs/extent-tree.c function. This could lead to a     system crash and a denial of service.(CVE-2018-14610i1/4%0

  - kernel/bpf/verifier.c in the Linux kernel through     4.14.8 mishandles states_equal comparisons between the     pointer data type and the UNKNOWN_VALUE data type,     which allows local users to obtain potentially     sensitive address information, aka a 'pointer     leak.'(CVE-2017-17864i1/4%0

  - drivers/hid/hid-lenovo-tpkbd.c in the Human Interface     Device (HID) subsystem in the Linux kernel through     3.11, when CONFIG_HID_LENOVO_TPKBD is enabled, allows     physically proximate attackers to cause a denial of     service (heap-based out-of-bounds write) via a crafted     device.(CVE-2013-2894i1/4%0

  - Memory leak in the sas_smp_get_phy_events function in     drivers/scsi/libsas/sas_expander.c in the Linux kernel     allows local users to cause a denial of service (kernel     memory exhaustion) via multiple read accesses to files     in the /sys/class/sas_phy directory.(CVE-2018-7757i1/4%0

  - It was found that the original fix for CVE-2016-6786     was incomplete. There exist a race between two     concurrent sys_perf_event_open() calls when both try     and move the same pre-existing software group into a     hardware context.(CVE-2017-6001i1/4%0

  - In the Linux kernel before 4.20.12,     net/ipv4/netfilter/nf_nat_snmp_basic_main.c in the SNMP     NAT module has insufficient ASN.1 length checks (aka an     array index error), making out-of-bounds read and write     operations possible, leading to an OOPS or local     privilege escalation. This affects snmp_version and     snmp_helper.(CVE-2019-9162i1/4%0

  - An information leak flaw was found in the way the Linux     kernel's Advanced Linux Sound Architecture (ALSA)     implementation handled access of the user control's     state. A local, privileged user could use this flaw to     leak kernel memory to user space.(CVE-2014-4652i1/4%0

  - A flaw was found that the vfs_rename() function did not     detect hard links on overlayfs. A local, unprivileged     user could use the rename syscall on overlayfs on top     of xfs to crash the system.(CVE-2016-6198i1/4%0

  - It was found that when file permissions were modified     via chmod and the user modifying them was not in the     owning group or capable of CAP_FSETID, the setgid bit     would be cleared. Setting a POSIX ACL via setxattr sets     the file permissions as well as the new ACL, but     doesn't clear the setgid bit in a similar way. This     could allow a local user to gain group privileges via     certain setgid applications.(CVE-2016-7097i1/4%0

  - A flaw was found in the way the Linux kernel's Crypto     subsystem handled automatic loading of kernel modules.
    A local user could use this flaw to load any installed     kernel module, and thus increase the attack surface of     the running kernel.(CVE-2014-9644i1/4%0

  - An arbitrary memory r/w access issue was found in the     Linux kernel compiled with the eBPF bpf(2) system call     (CONFIG_BPF_SYSCALL) support. The issue could occur due     to calculation errors in the eBPF verifier module,     triggered by user supplied malicious BPF program. An     unprivileged user could use this flaw to escalate their     privileges on a system. Setting parameter     'kernel.unprivileged_bpf_disabled=1' prevents such     privilege escalation by restricting access to bpf(2)     call.(CVE-2017-16995i1/4%0

  - A flaw was found in the implementation of associative     arrays where the add_key systemcall and KEYCTL_UPDATE     operations allowed for a NULL payload with a nonzero     length. When accessing the payload within this length     parameters value, an unprivileged user could trivially     cause a NULL pointer dereference (kernel     oops).(CVE-2017-15274i1/4%0

  - A flaw was found in the Linux kernel's keyring handling     code: the key_reject_and_link() function could be     forced to free an arbitrary memory block. An attacker     could use this flaw to trigger a use-after-free     condition on the system, potentially allowing for     privilege escalation.(CVE-2016-4470i1/4%0

  - A flaw was found in the way certain interfaces of the     Linux kernel's Infiniband subsystem used write() as     bi-directional ioctl() replacement, which could lead to     insufficient memory security checks when being invoked     using the splice() system call. A local unprivileged     user on a system with either Infiniband hardware     present or RDMA Userspace Connection Manager Access     module explicitly loaded, could use this flaw to     escalate their privileges on the     system.(CVE-2016-4565i1/4%0

  - It was found that the Linux kernel's IPv6 network stack     did not properly validate the value of the MTU variable     when it was set. A remote attacker could potentially     use this flaw to disrupt a target system's networking     (packet loss) by setting an invalid MTU value, for     example, via a NetworkManager daemon that is processing     router advertisement packets running on the target     system.(CVE-2015-8215i1/4%0

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

----

The 4.20.13 stable kernel update contains a number of important fixes across the tree.

----

The 4.20.12 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.

The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3930-2 advisory.

  - In the Linux kernel through 4.19.6, a local user could exploit a use-after-free in the ALSA driver by     supplying a malicious USB Sound device (with zero interfaces) that is mishandled in usb_audio_probe in     sound/usb/card.c. (CVE-2018-19824)

  - A heap address information leak while using L2CAP_GET_CONF_OPT was discovered in the Linux kernel before     5.1-rc1. (CVE-2019-3459)

  - A heap data infoleak in multiple locations including L2CAP_PARSE_CONF_RSP was found in the Linux kernel     before 5.1-rc1. (CVE-2019-3460)

  - In the Linux kernel before 4.20.8, kvm_ioctl_create_device in virt/kvm/kvm_main.c mishandles reference     counting because of a race condition, leading to a use-after-free. (CVE-2019-6974)

  - The KVM implementation in the Linux kernel through 4.20.5 has a Use-after-Free. (CVE-2019-7221)

  - The KVM implementation in the Linux kernel through 4.20.5 has an Information Leak. (CVE-2019-7222)

  - kernel/bpf/verifier.c in the Linux kernel before 4.20.6 performs undesirable out-of-bounds speculation on     pointer arithmetic in various cases, including cases of different branches with different state or limits     to sanitize, leading to side-channel attacks. (CVE-2019-7308)

  - In the Linux kernel through 4.20.11, af_alg_release() in crypto/af_alg.c neglects to set a NULL value for     a certain structure member, which leads to a use-after-free in sockfs_setattr. (CVE-2019-8912)

  - In the Linux Kernel before versions 4.20.8 and 4.19.21 a use-after-free error in the sctp_sendmsg()     function (net/sctp/socket.c) when handling SCTP_SENDALL flag can be exploited to corrupt memory.
    (CVE-2019-8956)

  - A memory leak in the kernel_read_file function in fs/exec.c in the Linux kernel through 4.20.11 allows     attackers to cause a denial of service (memory consumption) by triggering vfs_read failures.
    (CVE-2019-8980)

  - In the Linux kernel before 4.20.5, attackers can trigger a drivers/char/ipmi/ipmi_msghandler.c use-after-     free and OOPS by arranging for certain simultaneous execution of the code, as demonstrated by a service     ipmievd restart loop. (CVE-2019-9003)

  - In the Linux kernel before 4.20.12, net/ipv4/netfilter/nf_nat_snmp_basic_main.c in the SNMP NAT module has     insufficient ASN.1 length checks (aka an array index error), making out-of-bounds read and write     operations possible, leading to an OOPS or local privilege escalation. This affects snmp_version and     snmp_helper. (CVE-2019-9162)

  - In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum     address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP     platforms. This is related to a capability check for the wrong task. (CVE-2019-9213)

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

ID	Name	Product	Family	Published	Updated	Severity
122521	Fedora 29 : kernel / kernel-headers (2019-7462acf8ba)	Nessus	Fedora Local Security Checks	3/1/2019	2/7/2020	high
123676	Ubuntu 18.10 : linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2 (USN-3930-1)	Nessus	Ubuntu Local Security Checks	4/3/2019	5/11/2023	high
124985	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1532)	Nessus	Huawei Local Security Checks	5/14/2019	5/20/2022	high
122769	Fedora 28 : kernel / kernel-headers (2019-196ab64d65)	Nessus	Fedora Local Security Checks	3/12/2019	2/5/2020	high
123677	Ubuntu 18.04 LTS : Linux kernel (HWE) vulnerabilities (USN-3930-2)	Nessus	Ubuntu Local Security Checks	4/3/2019	1/9/2024	high

Detections

Analytics

Plugins Search

high

high

high

high

high