Improper access control in Linux kernel - CVE-2026-63844
Published: July 20, 2026
Vulnerability identifier: #VU138804
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-2026-63844
CWE-ID: CWE-284
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 improper access control in the amdgpu JPEG v4.0.3 ring when processing command submissions with user fences. A local user can submit a crafted command submission with a user fence to cause a denial of service.
How to mitigate CVE-2026-63844
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/249fa7549736de1c8e327d7ca6b32fa148a40bd6
- https://git.kernel.org/stable/c/83e37c0987ca92f9e87789b46dd311dcf5a4a6c8
- https://git.kernel.org/stable/c/8549b3933038e68dc61cb934b9a54223dd244a78
- https://git.kernel.org/stable/c/b884ff67d62ef514eee9d5f605c03101c8b6bc98
- https://git.kernel.org/stable/c/d6bd2a5fd611ec9c8a2411f084cff2435c709608