SB2026050991 - Improper locking in Linux kernel dc core driver
Published: May 9, 2026
Security Bulletin ID
SB2026050991
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 locking (CVE-ID: CVE-2026-43305)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock management in the drm/amd/display hardware sequencing fast path when using the DMUB HW lock on ASICs without FAMS support. A local user can trigger the fast path to cause a denial of service.
Exploitation is limited to systems using the affected fast path on ASICs without FAMS support.
Remediation
Install update from vendor's website.