Use-after-free in Linux kernel - CVE-2026-31444
Published: April 24, 2026
Vulnerability identifier: #VU127699
CSH Severity: Low
CVSS v4.0: 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-2026-31444
CWE-ID: CWE-416
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 use-after-free in smb_grant_oplock() when publishing oplock state to internal lists during concurrent access. A local user can trigger concurrent oplock operations to cause a denial of service.
The issue also involves a NULL pointer dereference in the same publication sequence.
How to mitigate CVE-2026-31444
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/48623ec358c1c600fa1e38368746f933e0f1a617
- https://git.kernel.org/stable/c/6d7e5a918c1d0aad06db0e17677b66fc9a471021
- https://git.kernel.org/stable/c/7de55bba69cbf0f9280daaea385daf08bc076121
- https://git.kernel.org/stable/c/9e785f004cbc56390479b77375726ea9b0d1a8a6
- https://git.kernel.org/stable/c/a5c6f6d6ceefed2d5210ee420fb75f8362461f46