SB20260720423 - Improper access control in Linux kernel amd amdgpu driver
Published: July 20, 2026
Security Bulletin ID
SB20260720423
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-63844)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.
References
- 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