CVE-2026-31566 drm/amdgpu: Fix fence put before wait in amdgpu_amdkfd_submit_ib
A use-after-free vulnerability in the Linux kernel's AMD GPU driver allows attackers to potentially execute arbitrary code or escalate privileges.
- 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-2026-31566?
CVE-2026-31566 is a high-severity use after free vulnerability in Linux kernel, published on 24 Apr 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: Fix fence put before wait in amdgpu_amdkfd_submit_ib
amdgpu_amdkfd_submit_ib() submits a GPU job and gets a fence from amdgpu_ib_schedule(). This fence is used to wait for job completion.
Currently, the code drops the fence reference using dma_fence_put() before calling dma_fence_wait().
If dma_fence_put() releases the last reference, the fence may be freed before dma_fence_wait() is called. This can lead to a use-after-free.
Fix this by waiting on the fence first and releasing the reference only after dma_fence_wait() completes.
Fixes the below: drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:697 amdgpu_amdkfd_submit_ib() warn: passing freed memory 'f' (line 696)
(cherry picked from commit 8b9e5259adc385b61a6590a13b82ae0ac2bd3482)
Weakness: CWE-416
Which versions are affected by CVE-2026-31566?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31566?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-31566 being exploited?
There is no known exploitation of CVE-2026-31566 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-83690, BELL-CVE-2026-31566, DEBIAN-CVE-2026-31566, GHSA-j5m6-wgmm-m7m9, ROOT-OS-DEBIAN-12-CVE-2026-31566, ROOT-OS-UBUNTU-2404-CVE-2026-31566 and 1 more.