CVE-2026-97928 drm/amdgpu: skip the VMID 0 flush for VRAM
A flaw in the amdgpu driver causes a spurious SDMA flush that can wedge the engine, leading to denial of service on GFX11 hardware.
- 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-2026-97928?
CVE-2026-97928 is a denial of service vulnerability in Linux, published on 25 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: skip the VMID 0 flush for VRAM
Clear-on-release only runs on VRAM, which amdgpu_ttm_map_buffer() reaches via its direct MC address without programming a GART window, yet the wipe still forces a VMID 0 flush. On GFX11 (e.g. Navi33) that spurious SDMA flush can wedge the engine; only flush when a GART window is actually used.
v2: Let amdgpu_ttm_map_buffer() return whether the VMID 0 flush is needed, and drive the clear and copy paths from that. (Christian) v3: Make the vm_needs_flush output parameter mandatory instead of allowing NULL. (Christian)
(cherry picked from commit a306e406e570b74318ff7d80e5b07b540ca1d3a9)
Which versions are affected by CVE-2026-97928?
How do I fix CVE-2026-97928?
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-2026-97928 being exploited?
There is no known exploitation of CVE-2026-97928 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-97928, DEBIAN-CVE-2026-97928, GHSA-x75f-rq9r-qmq7, UBUNTU-CVE-2026-97928.