SB20260720415 - Improper input validation in Linux kernel amd amdgpu driver
Published: July 20, 2026
Security Bulletin ID
SB20260720415
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 input validation (CVE-ID: CVE-2026-63855)
CWE-ID: CWE-20 - Improper input validation
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 input validation in the VCN v2.5 encoder and decoder rings when processing command submission requests 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/2c6fb056567efb49f8674108b86088a1cfaa86d0
- https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704
- https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9
- https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3
- https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f