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CVE-2026-63855

drm/amdgpu/vcn: set no_user_fence for VCN v2.5 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 v2.5 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 efc9dd5590894109bce9a0bfe1fa5592dd6b20b1)

Affected

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

Linux Kernel· Linux
95%
5.4 ≤ v < 6.6.1416.13 ≤ v < 6.18.336.19 ≤ v < 7.0.106.7 ≤ v < 6.12.9128c17d72072b7ce5cc13a527dcbfc045cc995e7d5.47.1
Vendor states this is fixed in 2c6fb056567efb49f8674108b86088a1cfaa86d0 (fixed)
Vendor states this is fixed in 4f317863a3ab212a027d8c8c3cc3af4e3fb95704 (fixed)
Vendor states this is fixed in 5a3c6f76cab164a5d803084908d7050f649ab7f9 (fixed)
Vendor states this is fixed in 602d4c5872b25ddd4d82fb2025efb9a05b187bb3 (fixed)
Vendor states this is fixed in 8f0ea4524dc71c6c9ec97f2711f46e12f624140f (fixed)
Vendor states this is fixed in 5.4 (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/2c6fb056567efb49f8674108b86088a1cfaa86d0
Patch
Source: cverecord
https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f
Patch
Source: cverecord
https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3
Patch
Source: cverecord
https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9
Patch
Source: cverecord
https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704
Source: cverecord
https://git.kernel.org/stable/c/8156e258025f2a22fcf7486c96848ac3cd3541dd

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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