Use-after-free in Linux kernel - CVE-2021-47162

Vulnerability identifier: #VU91064

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2021-47162

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

Affected software:
Linux kernel
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension 12
openEuler
Dell Data Protection Central
PowerProtect DP Series Appliance (IDPA)
RecoverPoint for Virtual Machines
kgraft-patch-4_12_14-122_237-default
kgraft-patch-4_12_14-122_219-default
kgraft-patch-4_12_14-122_212-default
kernel-syms-rt
kernel-rt_debug-devel-debuginfo
ocfs2-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
kernel-rt-debuginfo
kernel-rt-debugsource
cluster-md-kmp-rt
gfs2-kmp-rt
kernel-rt-devel
cluster-md-kmp-rt-debuginfo
kernel-rt_debug-debuginfo
dlm-kmp-rt
ocfs2-kmp-rt
kernel-rt_debug-debugsource
kernel-rt-devel-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
gfs2-kmp-rt-debuginfo
kernel-rt_debug-devel
kernel-devel-rt
kernel-source-rt
kernel-rt_debug
kernel-rt
kernel-azure-base-debuginfo
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-base
kernel-devel-azure
kernel-source-azure
kernel-default-devel
kernel-obs-build
kernel-docs
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-default-devel-debuginfo
kernel-devel
kernel-macros
kernel-source
kernel-default
cluster-md-kmp-default
kernel-obs-build-debugsource
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default
kernel-syms
kernel-default-base
dlm-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-default-base-debuginfo
kernel-default-debuginfo
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-man
kernel
kernel-debuginfo
bpftool
kernel-tools-debuginfo
bpftool-debuginfo
kernel-tools
python3-perf-debuginfo
perf-debuginfo
kernel-tools-devel
perf
python2-perf
kernel-debugsource
python2-perf-debuginfo
python3-perf
Dell Secure Connect Gateway

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the tipc_buf_append() function in net/tipc/msg.c. A local user can escalate privileges on the system.

Install update from vendor's website.

• https://git.kernel.org/stable/c/b2c8d28c34b3070407cb1741f9ba3f15d0284b8b
• https://git.kernel.org/stable/c/5489f30bb78ff0dafb4229a69632afc2ba20765c
• https://git.kernel.org/stable/c/436d650d374329a591c30339a91fa5078052ed1e
• https://git.kernel.org/stable/c/4b1761898861117c97066aea6c58f68a7787f0bf
• https://git.kernel.org/stable/c/64d17ec9f1ded042c4b188d15734f33486ed9966
• https://git.kernel.org/stable/c/6da24cfc83ba4f97ea44fc7ae9999a006101755c
• https://git.kernel.org/stable/c/ace300eecbccaa698e2b472843c74a5f33f7dce8
• https://git.kernel.org/stable/c/b7df21cf1b79ab7026f545e7bf837bd5750ac026
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.235
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.193
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.271
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.271
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.42
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.9
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.124