CVE-2026-80539 drm/amdgpu: disallow multiple FENCE chunks in one submit
A local attacker can leak memory references in the AMDGPU driver by submitting duplicate fence chunks, leading to resource exhaustion and denial of service.
- 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-2026-80539?
CVE-2026-80539 is a memory corruption 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: disallow multiple FENCE chunks in one submit
amdgpu_cs_pass1() dispatches on chunk_id once per chunk without rejecting repeated ids. p->uf_bo is a single-slot field, so a submission carrying two AMDGPU_CHUNK_ID_FENCE chunks runs amdgpu_cs_p1_user_fence() twice, and the second run overwrites p->uf_bo with a freshly referenced BO without dropping the reference taken by the first.
amdgpu_cs_parser_fini() only unrefs the final p->uf_bo, so every FENCE chunk but the last leaks a BO reference. The leaked BO outlives handle close and process exit.
Reject duplicate FENCE chunks the same way commit fec5f8e8c6bc ("drm/amdgpu: disallow multiple BO_HANDLES chunks in one submit") did for p->bo_list.
(cherry picked from commit 665b1fc2a1845206408f9a2c6da67101789edb82)
Which versions are affected by CVE-2026-80539?
How do I fix CVE-2026-80539?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-80539 being exploited?
There is no known exploitation of CVE-2026-80539 in the wild and no public exploit code.
Sources
Also known as AZL-97749, BELL-CVE-2026-80539, DEBIAN-CVE-2026-80539, GHSA-5jg9-2pjg-5862, UBUNTU-CVE-2026-80539.