CVE-2026-89820 drm/amd/display: fix dc_lock leak on GPU reset error paths
A lock leak in the AMD display driver during GPU reset errors causes subsequent hangs, leading to a local denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89820?
CVE-2026-89820 is a denial of service vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: fix dc_lock leak on GPU reset error paths
On GPU reset, dm_suspend() takes dc_lock and leaves it for dm_resume() to drop. If amdgpu_dm_commit_zero_streams() or dm_dmub_hw_init() fails, the function returns with the lock still held. The matching resume path is then skipped, so every later dc_lock take hangs.
Release the cached DC state and unlock before returning the error.
Which versions are affected by CVE-2026-89820?
How do I fix CVE-2026-89820?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-89820 being exploited?
There is no known exploitation of CVE-2026-89820 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89820, DEBIAN-CVE-2026-89820, GHSA-3jx4-mfrm-mq9q, UBUNTU-CVE-2026-89820.