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CVE-2026-63854

drm/amdgpu/vcn: set no_user_fence for VCN v3.0 enc/dec rings

HIGH
7.8
CVSS Score
Published: July 19, 2026 at 02:04 PM UTC
Updated: October 30, 2026 at 01:19 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 v3.0 enc/dec rings VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 663bed3c7b8b9a7624b0d95d300ddae034ad0614)

Affected

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

Linux Kernel· Linux
95%
5.9 ≤ v < 6.6.1416.13 ≤ v < 6.18.336.19 ≤ v < 7.0.106.7 ≤ v < 6.12.915.97.1cf14826cdfb5c9fe10f98210d040b9d7486c381d
Vendor states this is fixed in 26c4f38529ac78930c9c4713e16ebc5b689bb0a3 (fixed)
Vendor states this is fixed in 2d6525e7b2504f5bbfe9417cddc1e8da858791dd (fixed)
Vendor states this is fixed in b076e45e6f757a2829e80d0144c1b5f201bee5af (fixed)
Vendor states this is fixed in e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c (fixed)
Vendor states this is fixed in f1e5a6660d7cbf006079126d9babbf0ccf538c6b (fixed)
Vendor states this is fixed in 5.9 (unaffected)
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 6.6.141 (unaffected)
Vendor states this is fixed in 7.0.10 (unaffected)
Vendor states this is fixed in 7.1 (unaffected)

References (6)

Patch
Source: cverecord
https://git.kernel.org/stable/c/e74fc9c72c1ba78d0de0b849f5929c3b39a8e20c
Patch
Source: cverecord
https://git.kernel.org/stable/c/26c4f38529ac78930c9c4713e16ebc5b689bb0a3
Patch
Source: cverecord
https://git.kernel.org/stable/c/2d6525e7b2504f5bbfe9417cddc1e8da858791dd
Patch
Source: cverecord
https://git.kernel.org/stable/c/b076e45e6f757a2829e80d0144c1b5f201bee5af
Patch
Source: cverecord
https://git.kernel.org/stable/c/f1e5a6660d7cbf006079126d9babbf0ccf538c6b
Source: cverecord
https://git.kernel.org/stable/c/e3d339b0d9051d49eb9c78459091bba4fb525100

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

StatusMODIFIED
CWE
CWE-20NVD-CWE-noinfo

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