CVE-2026-89814 drm/amdgpu: clamp the isolation index for rings outside a partition
An out-of-bounds array access in the amdgpu driver can cause a kernel crash when SDMA submissions occur on rings outside a partition.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89814?
CVE-2026-89814 is a high-severity 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: clamp the isolation index for rings outside a partition
adev->isolation[] has one slot per partition, but a ring that is not assigned to one keeps AMDGPU_XCP_NO_PARTITION, which is ~0, so indexing the array with it is out of bounds. SDMA submissions hit this on both the isolation enforcement and the VM flush path and trip UBSAN.
Fall back to the first slot the way the cleaner shader path already does, and stop taking the address before the ring type check that makes it relevant.
Which versions are affected by CVE-2026-89814?
How do I fix CVE-2026-89814?
Apply the vendor's patch.
Is CVE-2026-89814 being exploited?
There is no known exploitation of CVE-2026-89814 in the wild and no public exploit code.
Sources
Also known as AZL-101589, BELL-CVE-2026-89814, DEBIAN-CVE-2026-89814, GHSA-hf6p-44h5-hp6x, UBUNTU-CVE-2026-89814.