Improper locking in Linux kernel - CVE-2022-50291

Vulnerability identifier: #VU115475

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2022-50291

CWE-ID: CWE-667

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the kcm_rfree(), reserve_rx_kcm() and unreserve_rx_kcm() functions in net/kcm/kcmsock.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Live Patching
kgraft-patch-4_12_14-122_275-default
kernel-default-base
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-default-devel-debuginfo
kernel-default-man
kernel-default
dlm-kmp-default-debuginfo
kernel-default-base-debuginfo
kernel-default-debugsource
kernel-default-devel
cluster-md-kmp-default-debuginfo
kernel-source
kernel-syms
gfs2-kmp-default
kernel-default-debuginfo
ocfs2-kmp-default-debuginfo
dlm-kmp-default
cluster-md-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
kernel-devel
kernel-macros

Install update from vendor's repository.

Linux kernel - update to 5.4.223
kgraft-patch-4_12_14-122_275-default - update to 1-8.3.1
kernel-default-base - update to 4.12.14-122.275.1
kernel-default-kgraft - update to 4.12.14-122.275.1
kernel-default-kgraft-devel - update to 4.12.14-122.275.1
kernel-default-devel-debuginfo - update to 4.12.14-122.275.1
kernel-default-man - update to 4.12.14-122.275.1
kernel-default - update to 4.12.14-122.275.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.275.1
kernel-default-base-debuginfo - update to 4.12.14-122.275.1
kernel-default-debugsource - update to 4.12.14-122.275.1
kernel-default-devel - update to 4.12.14-122.275.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.275.1
kernel-source - update to 4.12.14-122.275.1
kernel-syms - update to 4.12.14-122.275.1
gfs2-kmp-default - update to 4.12.14-122.275.1
kernel-default-debuginfo - update to 4.12.14-122.275.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.275.1
dlm-kmp-default - update to 4.12.14-122.275.1
cluster-md-kmp-default - update to 4.12.14-122.275.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.275.1
ocfs2-kmp-default - update to 4.12.14-122.275.1
kernel-devel - update to 4.12.14-122.275.1
kernel-macros - update to 4.12.14-122.275.1

• https://git.kernel.org/stable/c/12a0eb340c9a22e0f8c00d2c0c1a60695ead926a
• https://git.kernel.org/stable/c/13dba69e18d04c8eec7596369f2a0596b0260275
• https://git.kernel.org/stable/c/15e4dabda11b0fa31d510a915d1a580f47dfc92e
• https://git.kernel.org/stable/c/1b8a5692ab25db4ef1c2cc8e5d21f7a65dc3d079
• https://git.kernel.org/stable/c/342d918cf9a45df9cf11bbe7162b851adefd178f
• https://git.kernel.org/stable/c/bf46af730e58d340f6f740bc69a07c5f6b85c655
• https://git.kernel.org/stable/c/c325f92d8d9b223d5842609ca067e898e9d34566
• https://git.kernel.org/stable/c/e94395e916b48a5b912a0a04570981b5b091acb0
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.223

• Improper locking in Linux kernel kcm
• SUSE update for the Linux Kernel