Improper locking in Linux kernel - CVE-2026-23161

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Main Vulnerability Database Vulnerabilities #VU122912

Improper locking in Linux kernel - CVE-2026-23161

Published: February 16, 2026


Vulnerability identifier: #VU122912
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-2026-23161
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 shmem_delete_from_page_cache() and shmem_undo_range() functions in mm/shmem.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Micro
openEuler
Ubuntu
bpftool
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel
kernel-source
linux-azure-fde-6.17 (Ubuntu package)
linux-gcp-6.17 (Ubuntu package)
linux-oracle-6.17 (Ubuntu package)
linux-azure-6.17 (Ubuntu package)
linux-oem-6.17 (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)
kernel-livepatch-6_12_0-160000_6-default
kernel-livepatch-SLE16_Update_1-debugsource
kernel-livepatch-6_12_0-160000_6-default-debuginfo

How to mitigate CVE-2026-23161

Install update from vendor's repository.

bpftool - update to 6.6.0-145.1.14.152
python3-perf-debuginfo - update to 6.6.0-145.1.14.152
python3-perf - update to 6.6.0-145.1.14.152
perf-debuginfo - update to 6.6.0-145.1.14.152
perf - update to 6.6.0-145.1.14.152
kernel-tools-devel - update to 6.6.0-145.1.14.152
kernel-tools-debuginfo - update to 6.6.0-145.1.14.152
kernel-tools - update to 6.6.0-145.1.14.152
kernel-headers - update to 6.6.0-145.1.14.152
kernel-devel - update to 6.6.0-145.1.14.152
kernel-debugsource - update to 6.6.0-145.1.14.152
kernel-debuginfo - update to 6.6.0-145.1.14.152
bpftool-debuginfo - update to 6.6.0-145.1.14.152
kernel - update to 6.6.0-145.1.14.152
kernel-source - update to 6.6.0-145.1.14.152
linux-azure-fde-6.17 (Ubuntu package) - update to 6.17.0-1018.18~24.04.1
linux-gcp-6.17 (Ubuntu package) - addressed in versions 6.17.0-1018.20~24.04.1, 6.17.0-1021.24~24.04.1
linux-oracle-6.17 (Ubuntu package) - addressed in versions 6.17.0-1019.19~24.04.3, 6.17.0-1019.19~24.04.3+1
linux-azure-6.17 (Ubuntu package) - update to 6.17.0-1021.21~24.04.1
linux-oem-6.17 (Ubuntu package) - update to 6.17.0-1030.30
linux-nvidia-6.17 (Ubuntu package) - update to 6.17.0-1031.31
kernel-livepatch-6_12_0-160000_6-default - update to 15-160000.1.1
kernel-livepatch-SLE16_Update_1-debugsource - update to 15-160000.1.1
kernel-livepatch-6_12_0-160000_6-default-debuginfo - update to 15-160000.1.1

External References

Related Security Bulletins