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CVE-2026-63856

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 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 v2.0 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 e2b5499fca55f1a32960a311bbb62e35891eaf73)

Affected

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

Linux Kernel· Linux
95%
5.3 ≤ v < 6.6.1416.13 ≤ v < 6.18.336.19 ≤ v < 7.0.106.7 ≤ v < 6.12.911b61de45dfaff00b627e47349a019658e39268b95.37.1
Vendor states this is fixed in 5e777bc4cbe928ac0fd95e368fee1540f2ce4db2 (fixed)
Vendor states this is fixed in 8d80b293b41fcb5e9396db93e788b0f4ebcbafb7 (fixed)
Vendor states this is fixed in ac06ce5cac9e711281585d09d00c6efcd9b86396 (fixed)
Vendor states this is fixed in c71aecae98e42dcf2baf462df50b3a2cf1a93fe4 (fixed)
Vendor states this is fixed in f264019be80de79f84f464846451445923bffea0 (fixed)
Vendor states this is fixed in 5.3 (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/f264019be80de79f84f464846451445923bffea0
Patch
Source: cverecord
https://git.kernel.org/stable/c/5e777bc4cbe928ac0fd95e368fee1540f2ce4db2
Patch
Source: cverecord
https://git.kernel.org/stable/c/ac06ce5cac9e711281585d09d00c6efcd9b86396
Patch
Source: cverecord
https://git.kernel.org/stable/c/c71aecae98e42dcf2baf462df50b3a2cf1a93fe4
Patch
Source: cverecord
https://git.kernel.org/stable/c/8d80b293b41fcb5e9396db93e788b0f4ebcbafb7
Source: cverecord
https://git.kernel.org/stable/c/bcb972496f189edbf56a18b14f9b4831fd127ab8

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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