SB20260720430 - Improper input validation in Linux kernel amd amdgpu driver
Published: July 20, 2026
Security Bulletin ID
SB20260720430
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-2026-63851)
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 amdgpu vcn v4.0.5 encoder ring when processing command submission requests with user fences. A local user can submit a crafted command stream with a user fence to cause a denial of service.
The issue affects VCN v4.0.5 encoder functionality because 64-bit user fence writes are not supported.
Remediation
Install update from vendor's website.