NULL pointer dereference in Linux kernel - CVE-2022-50481

Vulnerability identifier: #VU116548

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-2022-50481

CWE-ID: CWE-476

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 NULL pointer dereference within the cxl_guest_init_afu() and cxl_guest_init_adapter() functions in drivers/misc/cxl/guest.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_280-default
ocfs2-kmp-default
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-devel-debuginfo
kernel-default-man
kernel-macros
kernel-devel
kernel-source
kernel-default
kernel-default-base-debuginfo
kernel-default-debuginfo
gfs2-kmp-default-debuginfo
kernel-default-devel
cluster-md-kmp-default
dlm-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default
kernel-default-base
kernel-syms

Install update from vendor's repository.

Linux kernel - update to 5.15.86
kgraft-patch-4_12_14-122_280-default - update to 1-8.5.1
ocfs2-kmp-default - update to 4.12.14-122.280.1
kernel-default-kgraft-devel - update to 4.12.14-122.280.1
kernel-default-kgraft - update to 4.12.14-122.280.1
kernel-default-devel-debuginfo - update to 4.12.14-122.280.1
kernel-default-man - update to 4.12.14-122.280.1
kernel-macros - update to 4.12.14-122.280.1
kernel-devel - update to 4.12.14-122.280.1
kernel-source - update to 4.12.14-122.280.1
kernel-default - update to 4.12.14-122.280.1
kernel-default-base-debuginfo - update to 4.12.14-122.280.1
kernel-default-debuginfo - update to 4.12.14-122.280.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.280.1
kernel-default-devel - update to 4.12.14-122.280.1
cluster-md-kmp-default - update to 4.12.14-122.280.1
dlm-kmp-default - update to 4.12.14-122.280.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.280.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.280.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.280.1
kernel-default-debugsource - update to 4.12.14-122.280.1
gfs2-kmp-default - update to 4.12.14-122.280.1
kernel-default-base - update to 4.12.14-122.280.1
kernel-syms - update to 4.12.14-122.280.1

• https://git.kernel.org/stable/c/170e8c2d2b61e15e7f7cfeded81bc1e959a15ed8
• https://git.kernel.org/stable/c/1ae581696b7a799afa39a664c4b721569643f58a
• https://git.kernel.org/stable/c/60b2ed21a65f3f5318666ccd765c3507991370cf
• https://git.kernel.org/stable/c/61c80d1c3833e196256fb060382db94f24d3d9a7
• https://git.kernel.org/stable/c/96fba6fb95bdede80583c262ac185da09661f264
• https://git.kernel.org/stable/c/ab44c182353be101c3be9465e1d15d42130c53c4
• https://git.kernel.org/stable/c/b32559ee4e6667c5c3daf4ec5454c277d1f255d2
• https://git.kernel.org/stable/c/d775a1da5a52b4f4bb02f2707ba420d1bec48dbb
• https://git.kernel.org/stable/c/e5021bbf11b024cc65ea1e84c377df484183be4b
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.86

• NULL pointer dereference in Linux kernel misc cxl driver
• SUSE update for the Linux Kernel