Improper locking in Linux kernel - CVE-2023-53020

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Main Vulnerability Database Vulnerabilities #VU106203

Improper locking in Linux kernel - CVE-2023-53020

Published: March 27, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU106203
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-2023-53020
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to improper locking within the l2tp_xmit_core(), l2tp_tunnel_create() and l2tp_tunnel_register() functions in net/l2tp/l2tp_core.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Live Patching
kgraft-patch-4_12_14-122_272-default
kgraft-patch-4_12_14-122_269-default
kgraft-patch-4_12_14-122_290-default
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-devel-debuginfo
kernel-default-man
kernel-devel
kernel-source
kernel-macros
kernel-default
dlm-kmp-default-debuginfo
kernel-default-debugsource
cluster-md-kmp-default-debuginfo
kernel-default-debuginfo
kernel-default-devel
gfs2-kmp-default
kernel-default-base
cluster-md-kmp-default
dlm-kmp-default
kernel-default-base-debuginfo
ocfs2-kmp-default-debuginfo
kernel-syms

How to mitigate CVE-2023-53020

Install update from vendor's website.

Linux kernel - update to 6.1.9
kgraft-patch-4_12_14-122_272-default - update to 1-8.3.1
kgraft-patch-4_12_14-122_269-default - update to 1-8.3.1
kgraft-patch-4_12_14-122_290-default - update to 1-8.7.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-kgraft-devel - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-kgraft - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-man - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-devel - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-source - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-macros - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-debugsource - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-devel - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
gfs2-kmp-default - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-base - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
dlm-kmp-default - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-default-base-debuginfo - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1
kernel-syms - addressed in versions 4.12.14-122.269.1, 4.12.14-122.272.1, 4.12.14-122.290.1

External References

Related Security Bulletins