Improper locking in Linux kernel - CVE-2026-89566
Published: September 12, 2026
Vulnerability identifier: #VU149240
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89566
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper locking in journal_shrink_one_cp_list() when skipping busy checkpoint buffers during checkpoint-list shrinking. A local user can trigger checkpoint-list shrinking under memory pressure to cause a denial of service.
The condition occurs when a checkpoint list contains mostly busy buffers.
Affected software
Linux kernel
How to mitigate CVE-2026-89566
Install security update from vendor's repository.