SB20260917144 - Improper locking in Linux kernel display amdgpu_dm driver
Published: September 17, 2026
Security Bulletin ID
SB20260917144
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-2026-89820)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 lock release in the AMD display manager's dm_suspend and dm_resume functions when handling GPU reset error paths. A local user can trigger a GPU reset that reaches an error path and leaves dc_lock held to cause a denial of service.
The condition occurs when amdgpu_dm_commit_zero_streams or dm_dmub_hw_init fails.
Remediation
Install update from vendor's website.