What’s Vulnerable › Vulnerabilities

CVE-2026-63851: drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 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 2026-10-26
• Weakness: CWE-20

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)

Affected products

• Linux kernel: from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 7.1-rc1 — fixed in 6.12.91, 6.18.33, 7.0.10
• Linux kernel: 6.7 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 6.12.91, 6.18.33, 7.0.10; Linux kernel 7.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/589a254bf3e88204c8402b9cbccd5e23a0af990f
• https://git.kernel.org/stable/c/6d9a98c5ed65ba92a09e4ca5a5f6941448145529
• https://git.kernel.org/stable/c/75091030f07b7957cc0646cd52e2d9d15f611483
• https://git.kernel.org/stable/c/7f23b5c420b9f68a210c29c5123bace670aa8cc9

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