CVE-2026-63849: drm/amdgpu/vcn: set no_user_fence for VCN v5.0.1 enc ring

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-19 · updated 2026-10-22
Weakness: CWE-20

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)

Affected products

Linux kernel: from 6.14 before 6.18.33; from 6.19 before 7.0.10; 7.1-rc1 — fixed in 6.18.33, 7.0.10

How to fix

Upgrade to a fixed version: Linux kernel 6.18.33, 7.0.10. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/081ef0e46c9cdd26c0db0ef721470393d36b6655
https://git.kernel.org/stable/c/5a4bffd67e94944ed3db26a959346cfb7fabaecd
https://git.kernel.org/stable/c/8f4954722eab88e10c4ea0c0d3b1269c31421d3a

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