CVE-2026-89812 drm/amdgpu: force complete the MES ring fences on reset
A flaw in the Linux kernel amdgpu driver causes a denial of service by wedging the GPU during reset due to unsynchronized MES ring fences.
- 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-2026-89812?
CVE-2026-89812 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/amdgpu: force complete the MES ring fences on reset
The MES scheduler ring has no drm scheduler (no_scheduler = true), so it is skipped by the force-completion loop in amdgpu_device_pre_asic_reset(). It uses a polling fence whose hw value lives in wb (GTT) memory and survives a MODE1 reset, while fence_drv.sync_seq keeps advancing for every packet.
When the reset is triggered because MES itself stopped responding, the timed-out packets advance sync_seq past the last hw fence value MES wrote. After resume the first MES submission polls forever on a seq that is never written back, failing the resume and wedging the box on a second reset:
amdgpu: MES ring buffer is full. amdgpu: *ERROR* ring gfx_0.0.0 test failed (-110) amdgpu: resume of IP block <gfx_v11_0> failed -110 amdgpu: GPU reset end with ret = -110
Force complete the MES scheduler ring fences together with the scheduler rings so their hw fence is realigned to sync_seq.
v2: cover all XCCs (one scheduler ring each), not just mes.ring[0].
Which versions are affected by CVE-2026-89812?
How do I fix CVE-2026-89812?
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-2026-89812 being exploited?
There is no known exploitation of CVE-2026-89812 in the wild and no public exploit code.
Sources
Also known as AZL-101312, BELL-CVE-2026-89812, DEBIAN-CVE-2026-89812, GHSA-45jc-gxg9-3gvc, UBUNTU-CVE-2026-89812.