Memory leak in Linux kernel - CVE-2026-31477
Published: April 24, 2026
Vulnerability identifier: #VU127672
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31477
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a memory leak in smb2_lock() when handling error paths after list_del() detaches smb_lock from lock_list. A local user can trigger unexpected error conditions in lock and unlock processing to cause a denial of service.
The issue affects both the non-UNLOCK path on unexpected vfs_lock_file() errors and the UNLOCK path when vfs_lock_file() returns -ENOENT.
How to mitigate CVE-2026-31477
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/309b44ed684496ed3f9c5715d10b899338623512
- https://git.kernel.org/stable/c/3cdacd11b41569ce75b3162142240f2355e04900
- https://git.kernel.org/stable/c/91aeaa7256006d79a37298f5a1df23325db91599
- https://git.kernel.org/stable/c/aab42f0795620cf0d3955a520f571f697d0f9a2a
- https://git.kernel.org/stable/c/c9b95ef6f5039f19e46c3a521a4fe1752d91dfe9
- https://git.kernel.org/stable/c/cdac6f7e7e428dc70e3b5898ac6999a72ed13993