CVE-2026-80576 drm/amdgpu: reject oversized IBs with per-ring packet limits
A local attacker can cause system instability or denial of service by submitting oversized command buffers to the AMD GPU driver due to missing size validation.
- 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-2026-80576?
CVE-2026-80576 is a high-severity vulnerability in Linux, published on 26 Aug 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: reject oversized IBs with per-ring packet limits
On GFX rings, amdgpu_cs_p2_ib() passed user-supplied ib_bytes through to ib->length_dw without a limit, while ring_emit_ib() encodes length into packet fields. Oversized values can corrupt adjacent control bits and destabilize command submission.
Add a per-ring IB packet size limit helper and reject command submissions exceeding the corresponding dword limit before IB allocation. Use the documented 20-bit limit for GFX/compute/SDMA/VPE, and apply the MM fallback limit for other ring types.
(cherry picked from commit 7f48fa2cf62e3fa6c9c3870aa74988f773247e52)
Which versions are affected by CVE-2026-80576?
How do I fix CVE-2026-80576?
Apply the vendor's patch.
Is CVE-2026-80576 being exploited?
There is no known exploitation of CVE-2026-80576 in the wild and no public exploit code.
Sources
Also known as AZL-97845, BELL-CVE-2026-80576, DEBIAN-CVE-2026-80576, GHSA-mv2f-pcc7-qh27, UBUNTU-CVE-2026-80576.