NULL pointer dereference in Linux kernel - CVE-2026-64331
Published: July 27, 2026
Vulnerability identifier: #VU139653
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-64331
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 vep_dequeue() when cancelling FunctionFS AIO requests. A local user can trigger request cancellation on the FunctionFS AIO path to cause a denial of service.
The issue is reachable when stressing FunctionFS endpoints via AIO in usbip's vudc path.
Affected software
Linux kernel
How to mitigate CVE-2026-64331
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9
- https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e
- https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652
- https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f
- https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd
- https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757
- https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a
- https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97