NULL pointer dereference in Linux kernel - CVE-2020-36789

Vulnerability identifier: #VU107701

CSH Severity: Low

CVSS v4 BT: 4.3 [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/E:U/U:Clear]

CVE-ID: CVE-2020-36789

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 can_get_echo_skb() function in drivers/net/can/dev.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 Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Live Patching
openEuler
kgraft-patch-4_12_14-122_258-default
ocfs2-kmp-default-debuginfo
cluster-md-kmp-default
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
kernel-syms
dlm-kmp-default-debuginfo
kernel-default-debugsource
kernel-default-devel-debuginfo
kernel-default-base
ocfs2-kmp-default
kernel-default-debuginfo
gfs2-kmp-default
gfs2-kmp-default-debuginfo
kernel-default-devel
kernel-default
kernel-devel
kernel-macros
kernel-source
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-man
dlm-kmp-default
bpftool
kernel
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-rt
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-source-rt

Install update from vendor's website.

Linux kernel - update to 5.4.78
kgraft-patch-4_12_14-122_258-default - update to 1-8.3.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.258.1
cluster-md-kmp-default - update to 4.12.14-122.258.1
kernel-default-base-debuginfo - update to 4.12.14-122.258.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.258.1
kernel-syms - update to 4.12.14-122.258.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.258.1
kernel-default-debugsource - update to 4.12.14-122.258.1
kernel-default-devel-debuginfo - update to 4.12.14-122.258.1
kernel-default-base - update to 4.12.14-122.258.1
ocfs2-kmp-default - update to 4.12.14-122.258.1
kernel-default-debuginfo - update to 4.12.14-122.258.1
gfs2-kmp-default - update to 4.12.14-122.258.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.258.1
kernel-default-devel - update to 4.12.14-122.258.1
kernel-default - update to 4.12.14-122.258.1
kernel-devel - update to 4.12.14-122.258.1
kernel-macros - update to 4.12.14-122.258.1
kernel-source - update to 4.12.14-122.258.1
kernel-default-kgraft-devel - update to 4.12.14-122.258.1
kernel-default-kgraft - update to 4.12.14-122.258.1
kernel-default-man - update to 4.12.14-122.258.1
dlm-kmp-default - update to 4.12.14-122.258.1
bpftool - update to 4.19.90-2505.1.0.0326
kernel - update to 4.19.90-2505.1.0.0326
bpftool-debuginfo - update to 4.19.90-2505.1.0.0326
kernel-debuginfo - update to 4.19.90-2505.1.0.0326
kernel-debugsource - update to 4.19.90-2505.1.0.0326
kernel-devel - update to 4.19.90-2505.1.0.0326
kernel-source - update to 4.19.90-2505.1.0.0326
kernel-tools - update to 4.19.90-2505.1.0.0326
kernel-tools-debuginfo - update to 4.19.90-2505.1.0.0326
kernel-tools-devel - update to 4.19.90-2505.1.0.0326
perf - update to 4.19.90-2505.1.0.0326
perf-debuginfo - update to 4.19.90-2505.1.0.0326
python2-perf - update to 4.19.90-2505.1.0.0326
python2-perf-debuginfo - update to 4.19.90-2505.1.0.0326
python3-perf - update to 4.19.90-2505.1.0.0326
python3-perf-debuginfo - update to 4.19.90-2505.1.0.0326
kernel-rt - update to 5.3.18-150300.208.1
kernel-rt-debugsource - update to 5.3.18-150300.208.1
kernel-rt-debuginfo - update to 5.3.18-150300.208.1
kernel-source-rt - update to 5.3.18-150300.208.1

• https://git.kernel.org/stable/c/2283f79b22684d2812e5c76fc2280aae00390365
• https://git.kernel.org/stable/c/248b71ce92d4f3a574b2537f9838f48e892618f4
• https://git.kernel.org/stable/c/3a922a85701939624484e7f2fd07d32beed00d25
• https://git.kernel.org/stable/c/451187b20431924d13fcfecc500d7cd2d9951bac
• https://git.kernel.org/stable/c/7e4cf2ec0ca236c3e5f904239cec6efe1f3baf22
• https://git.kernel.org/stable/c/87530b557affe01c764de32dbeb58cdf47234574
• https://git.kernel.org/stable/c/ab46748bf98864f9c3f5559060bf8caf9df2b41e
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.78

• NULL pointer dereference in Linux kernel net can driver
• openEuler 20.03 LTS SP4 update for kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel