CVE-2026-63851 drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring
A missing check in the AMD GPU VCN driver allows invalid user fence submissions, potentially causing system instability or crashes.
- 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-2026-63851?
CVE-2026-63851 is a high-severity vulnerability in Linux kernel, published on 19 Jul 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/vcn: set no_user_fence for VCN v4.0.5 enc ring
VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences.
(cherry picked from commit 084d94ac93707bdda07efb5cee786f632de4219b)
Weakness: CWE-20
Which versions are affected by CVE-2026-63851?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-63851?
Apply the vendor's patch.
Is CVE-2026-63851 being exploited?
There is no known exploitation of CVE-2026-63851 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-63851, DEBIAN-CVE-2026-63851, GHSA-jcqr-j666-39jw, UBUNTU-CVE-2026-63851.