CVE-2026-63855

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)

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-25)

CWE

CWE-20

Published

2026-07-19

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

References

• https://git.kernel.org/stable/c/2c6fb056567efb49f8674108b86088a1cfaa86d0
• https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704
• https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9
• https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3
• https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f

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