NULL pointer dereference in Linux kernel - CVE-2026-64358
Published: July 27, 2026
Vulnerability identifier: #VU139608
CSH Severity: Low
CVSS v4: 4.8 [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]
CVE-ID: CVE-2026-64358
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 improper handling of a null workqueue callback in mtk_jpeg_release() when releasing a JPEG device context on platforms that do not use the workqueue. A local user can trigger release of the affected device context to cause a denial of service.
The issue results in a WARN_ON condition in __flush_work() because cancel_work_sync() is invoked even when no workqueue callback is defined.
Affected software
Linux kernel
How to mitigate CVE-2026-64358
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/0fed0fc34ce734b4b8c2f6a467d38bddcb21dda9
- https://git.kernel.org/stable/c/4c4b4af4a9f278da096f0dbdb6b59594701d29bf
- https://git.kernel.org/stable/c/973408ceab14555a8548b97c8cc7b54208c3f251
- https://git.kernel.org/stable/c/ac0774961a6ea174a71d4ffa39966edafbf7662d
- https://git.kernel.org/stable/c/b1845a227fda37b2fe5327df3ca0015d7e290235