NULL pointer dereference in Linux kernel - CVE-2026-89484
Published: September 12, 2026
Vulnerability identifier: #VU149317
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89484
CWE-ID: CWE-476
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 a NULL pointer dereference in nlmclnt_locks_release_private() when releasing a partially initialized file_lock after lockowner allocation failure. A local user can trigger a lockowner allocation failure during NLM file lock initialization to cause a denial of service.
The VFS may release the partially initialized file lock after NLM client processing returns an out-of-memory error.
Affected software
Linux kernel
How to mitigate CVE-2026-89484
Install security update from vendor's repository.