Improper locking in Linux kernel - CVE-2026-89820
Published: September 17, 2026
Vulnerability identifier: #VU150466
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89820
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89820
Install security update from vendor's repository.