Improper locking in Linux kernel - CVE-2026-23161

Vulnerability identifier: #VU122912

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-2026-23161

CWE-ID: CWE-667

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 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.

Linux kernel
openEuler
Ubuntu
bpftool
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel
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)

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-source - 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
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

• https://git.kernel.org/stable/c/8a1968bd997f45a9b11aefeabdd1232e1b6c7184
• https://git.kernel.org/stable/c/a99f9a4669a04662c8f9efe0e62cafc598153139
• https://git.kernel.org/stable/c/b23bee8cdb7aabce5701a7f57414db5a354ae8ed

• Improper locking in Linux kernel mm
• openEuler 24.03 LTS SP1 update for kernel
• Ubuntu update for linux-gcp-6.17
• Ubuntu update for linux-oem-6.17
• Ubuntu update for linux-azure-fde-6.17
• Ubuntu update for linux-azure-6.17
• Ubuntu update for linux-oracle-6.17