The SUSE Linux Enterprise 12 SP4 LTSS kernel was updated to receive various security and bugfixes.

The following security bugs were fixed :

CVE-2020-36312: Fixed an issue in virt/kvm/kvm_main.c that had a kvm_io_bus_unregister_dev memory leak upon a kmalloc failure (bnc#1184509).

CVE-2021-29650: Fixed an issue inside the netfilter subsystem that allowed attackers to cause a denial of service (panic) because net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h lack a full memory barrier upon the assignment of a new table value (bnc#1184208).

CVE-2021-29155: Fixed an issue within kernel/bpf/verifier.c that performed 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 (bnc#1184942).

CVE-2020-36310: Fixed an issue in arch/x86/kvm/svm/svm.c that allowed a set_memory_region_test infinite loop for certain nested page faults (bnc#1184512).

CVE-2020-27673: Fixed an issue in Xen where a guest OS users could have caused a denial of service (host OS hang) via a high rate of events to dom0 (bnc#1177411, bnc#1184583).

CVE-2021-29154: Fixed BPF JIT compilers that allowed to execute arbitrary code within the kernel context (bnc#1184391).

CVE-2020-25673: Fixed NFC endless loops caused by repeated llcp_sock_connect() (bsc#1178181).

CVE-2020-25672: Fixed NFC memory leak in llcp_sock_connect() (bsc#1178181).

CVE-2020-25671: Fixed NFC refcount leak in llcp_sock_connect() (bsc#1178181).

CVE-2020-25670: Fixed NFC refcount leak in llcp_sock_bind() (bsc#1178181).

CVE-2020-36311: Fixed an issue in arch/x86/kvm/svm/sev.c that allowed attackers to cause a denial of service (soft lockup) by triggering destruction of a large SEV VM (which requires unregistering many encrypted regions) (bnc#1184511).

CVE-2021-28950: Fixed an issue in fs/fuse/fuse_i.h where a 'stall on CPU' could have occured because a retry loop continually finds the same bad inode (bnc#1184194, bnc#1184211).

CVE-2020-36322: Fixed an issue inside the FUSE filesystem implementation where fuse_do_getattr() calls make_bad_inode() in inappropriate situations, could have caused a system crash. NOTE: the original fix for this vulnerability was incomplete, and its incompleteness is tracked as CVE-2021-28950 (bnc#1184211).

CVE-2021-30002: Fixed a memory leak issue when a webcam device exists (bnc#1184120).

CVE-2021-3483: Fixed a use-after-free bug in nosy_ioctl() (bsc#1184393).

CVE-2021-20219: Fixed a denial of service vulnerability in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker with a normal user privilege could have delayed the loop and cause a threat to the system availability (bnc#1184397).

CVE-2021-28964: Fixed a race condition in fs/btrfs/ctree.c that could have caused a denial of service because of a lack of locking on an extent buffer before a cloning operation (bnc#1184193).

CVE-2021-3444: Fixed the bpf verifier as it did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution (bnc#1184170).

CVE-2021-28971: Fixed a potential local denial of service in intel_pmu_drain_pebs_nhm where userspace applications can cause a system crash because the PEBS status in a PEBS record is mishandled (bnc#1184196).

CVE-2021-28688: Fixed XSA-365 that 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 (bnc#1183646).

CVE-2021-29265: Fixed an issue in usbip_sockfd_store in drivers/usb/usbip/stub_dev.c that allowed 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 (bnc#1184167).

CVE-2021-29264: Fixed an issue in drivers/net/ethernet/freescale/gianfar.c in the Freescale Gianfar Ethernet driver that allowed 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 (bnc#1184168).

CVE-2021-28972: Fixed an issue in drivers/pci/hotplug/rpadlpar_sysfs.c where the RPA PCI Hotplug driver had 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 (bnc#1184198).

CVE-2021-29647: Fixed an issue in kernel qrtr_recvmsg in net/qrtr/qrtr.c that allowed attackers to obtain sensitive information from kernel memory because of a partially uninitialized data structure (bnc#1184192).

CVE-2020-27171: Fixed an issue in kernel/bpf/verifier.c that had 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 (bnc#1183686, bnc#1183775).

CVE-2020-27170: Fixed an issue in kernel/bpf/verifier.c that performed undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. This affects pointer types that do not define a ptr_limit (bnc#1183686 bnc#1183775).

CVE-2021-28660: Fixed rtw_wx_set_scan in drivers/staging/rtl8188eu/os_dep/ioctl_linux.c that allowed writing beyond the end of the ssid array (bnc#1183593).

CVE-2020-35519: Update patch reference for x25 fix (bsc#1183696).

CVE-2021-3428: Fixed ext4 integer overflow in ext4_es_cache_extent (bsc#1173485, bsc#1183509).

CVE-2020-0433: Fixed blk_mq_queue_tag_busy_iter of blk-mq-tag.c, where a possible use after free due to improper locking could have happened.
This could have led to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation (bnc#1176720).

CVE-2021-28038: Fixed an issue with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations (as a result of changes to the handling of grant mapping errors). A host OS denial of service may occur during misbehavior of a networking frontend driver. NOTE: this issue exists because of an incomplete fix for CVE-2021-26931 (bnc#1183022, bnc#1183069).

CVE-2020-27815: Fixed jfs array index bounds check in dbAdjTree (bsc#1179454).

CVE-2021-27365: Fixed an issue inside the iSCSI data structures that does 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 (bnc#1182715).

CVE-2021-27363: Fixed an issue with a kernel pointer leak that could have been 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 (bnc#1182716).

CVE-2021-27364: Fixed an issue in drivers/scsi/scsi_transport_iscsi.c where an unprivileged user can craft Netlink messages (bnc#1182717).

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 remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4948-1 advisory.

    Ryota Shiga discovered that the eBPF implementation in the Linux kernel did not properly verify that a BPF     program only reserved as much memory for a ring buffer as was allocated. A local attacker could use this     to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3489)

    Manfred Paul discovered that the eBPF implementation in the Linux kernel did not properly track bounds on     bitwise operations. A local attacker could use this to cause a denial of service (system crash) or execute     arbitrary code. (CVE-2021-3490)

    Billy Jheng Bing-Jhong discovered that the io_uring implementation of the Linux kernel did not properly     enforce the MAX_RW_COUNT limit in some situations. A local attacker could use this to cause a denial of     service (system crash) or execute arbitrary code. (CVE-2021-3491)

    Kiyin () discovered that the NFC LLCP protocol implementation in the Linux kernel contained a     reference counting error. A local attacker could use this to cause a denial of service (system crash).
    (CVE-2020-25670)

    Kiyin () discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly     deallocate memory in certain error situations. A local attacker could use this to cause a denial of     service (memory exhaustion). (CVE-2020-25671, CVE-2020-25672)

    It was discovered that the Xen paravirtualization backend in the Linux kernel did not properly deallocate     memory in some situations. A local attacker could use this to cause a denial of service (memory     exhaustion). (CVE-2021-28688)

    It was discovered that the io_uring subsystem in the Linux kernel contained a race condition leading to a     deadlock condition. A local attacker could use this to cause a denial of service. (CVE-2021-28951)

    John Stultz discovered that the audio driver for Qualcomm SDM845 systems in the Linux kernel did not     properly validate port ID numbers. A local attacker could use this to cause a denial of service (system     crash) or possibly execute arbitrary code. (CVE-2021-28952)

    Zygo Blaxell discovered that the btrfs file system implementation in the Linux kernel contained a race     condition during certain cloning operations. A local attacker could possibly use this to cause a denial of     service (system crash). (CVE-2021-28964)

    Vince Weaver discovered that the perf subsystem in the Linux kernel did not properly handle certain PEBS     records properly for some Intel Haswell processors. A local attacker could use this to cause a denial of     service (system crash). (CVE-2021-28971)

    It was discovered that the RPA PCI Hotplug driver implementation in the Linux kernel did not properly     handle device name writes via sysfs, leading to a buffer overflow. A privileged attacker could use this to     cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-28972)

    It was discovered that the Freescale Gianfar Ethernet driver for the Linux kernel did not properly handle     receive queue overrun when jumbo frames were enabled in some situations. An attacker could use this to     cause a denial of service (system crash). (CVE-2021-29264)

    It was discovered that the vDPA backend virtio driver in the Linux kernel contained a use-after-free     vulnerability. An attacker could use this to cause a denial of service (system crash) or possibly execute     arbitrary code. (CVE-2021-29266)

    It was discovered that the TIPC protocol implementation in the Linux kernel did not properly validate     passed encryption key sizes. A local attacker could use this to cause a denial of service (system crash).
    (CVE-2021-29646)

    It was discovered that the Qualcomm IPC router implementation in the Linux kernel did not properly     initialize memory passed to user space. A local attacker could use this to expose sensitive information     (kernel memory). (CVE-2021-29647)

    It was discovered that the BPF user mode driver implementation in the Linux kernel did not properly     deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory     exhaustion). (CVE-2021-29649)

    It was discovered that a race condition existed in the netfilter subsystem of the Linux kernel when     replacing tables. A local attacker could use this to cause a denial of service (system crash).
    (CVE-2021-29650)

    Felix Wilhelm discovered that the KVM implementation in the Linux kernel for AMD processors contained race     conditions on nested VMCB controls. A local attacker in a guest vm could possibly use this to gain     elevated privileges. (CVE-2021-29657)

    Dan Carpenter discovered that the block device manager (dm) implementation in the Linux kernel contained a     buffer overflow in the ioctl for listing devices. A privileged local attacker could use this to cause a     denial of service (system crash). (CVE-2021-31916)

     discovered that the IEEE 1394 (Firewire) nosy packet sniffer driver in the Linux kernel did not     properly perform reference counting in some situations, leading to a use-after-free vulnerability. A local     attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2021-3483)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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

The remote SUSE Linux SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:0291-1 advisory.

    This update for the Linux Kernel 5.3.18-24_49 fixes several issues.

    The following security issues were fixed:

    - CVE-2022-0185: Incorrect param length parsing in legacy_parse_param which could have led to a local     privilege escalation (bsc#1194517).
    - CVE-2021-4154: Fixed option parsing with cgroups version 1 (bsc#1193842).
    - CVE-2020-3702: Fixed a bug which could be triggered with specifically timed and handcrafted traffic and     cause internal errors in a WLAN device that lead to improper layer 2 Wi-Fi encryption with a consequent     possibility of information disclosure. (bsc#1191193)
    - CVE-2020-25670, CVE-2020-25671, CVE-2020-25672, CVE-2020-25673, CVE-2021-23134: Fixed multiple bugs in     NFC subsytem (bsc#1178181, bsc#1186060).
    - CVE-2021-42739: The firewire subsystem had a buffer overflow related to drivers/media/firewire/firedtv-     avc.c and drivers/media/firewire/firedtv-ci.c, because avc_ca_pmt mishandled bounds checking     (bsc#1184673).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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
149491	SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1596-1)	Nessus	SuSE Local Security Checks	5/14/2021	1/2/2024	high
149892	openSUSE Security Update : the Linux Kernel (openSUSE-2021-758)	Nessus	SuSE Local Security Checks	5/25/2021	12/28/2023	critical
149407	Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4948-1)	Nessus	Ubuntu Local Security Checks	5/12/2021	8/28/2024	high
157344	SUSE SLES15: kernel-livepatch-5_3_18-24_49-default / etc (SUSE-SU-2022:0291-1)	Nessus	SuSE Local Security Checks	2/3/2022	6/26/2026	high

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