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CVE-2026-63851

drm/amdgpu/vcn: set no_user_fence for VCN v4.0.5 enc ring

HIGH
7.8
CVSS Score
Published: July 19, 2026 at 02:04 PM UTC
Updated: October 26, 2026 at 07:59 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
6.13 ≤ v < 6.18.336.19 ≤ v < 7.0.106.7 ≤ v < 6.12.91547aad32edac17a3ec4989d8aad2426d0cbeb5906.77.1
Vendor states this is fixed in 589a254bf3e88204c8402b9cbccd5e23a0af990f (fixed)
Vendor states this is fixed in 6d9a98c5ed65ba92a09e4ca5a5f6941448145529 (fixed)
Vendor states this is fixed in 75091030f07b7957cc0646cd52e2d9d15f611483 (fixed)
Vendor states this is fixed in 7f23b5c420b9f68a210c29c5123bace670aa8cc9 (fixed)
Vendor states this is fixed in 6.12.91 (unaffected)
Vendor states this is fixed in 6.18.33 (unaffected)
Vendor states this is fixed in 6.7 (unaffected)
Vendor states this is fixed in 7.0.10 (unaffected)
Vendor states this is fixed in 7.1 (unaffected)

References (4)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusANALYZED
CWE
CWE-20NVD-CWE-noinfo

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