CVE-2026-63849 drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 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-2026-63849?
CVE-2026-63849 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 v5.0.1 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 e16be95a2c3ee712b142cb27d2dca0b461181359)
Weakness: CWE-20
Which versions are affected by CVE-2026-63849?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-63849?
Apply the vendor's patch.
Is CVE-2026-63849 being exploited?
There is no known exploitation of CVE-2026-63849 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-63849, DEBIAN-CVE-2026-63849, GHSA-r2qg-mr7w-fwj6, UBUNTU-CVE-2026-63849.