Improper access control in Linux kernel - CVE-2026-63845
Published: July 20, 2026
Vulnerability identifier: #VU138805
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-2026-63845
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 ring command submission handling when processing command submissions with user fences. A local user can submit a command stream with a user fence to cause a denial of service.
How to mitigate CVE-2026-63845
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/6876d05b899102f4dfdb9ad560132126144c1c72
- https://git.kernel.org/stable/c/a676f16ea9a7df96d69f405afb6eb349571b3382
- https://git.kernel.org/stable/c/af4b458daa597dae707bf3f1f74745f5fc133ca2
- https://git.kernel.org/stable/c/d4e0172a1b614373385e9b7111b580f8d2e0b98f
- https://git.kernel.org/stable/c/e7e90b5839aeb8805ec83bb4da610b8dab8e184d