CVE-2026-63855
Published Jul 19, 2026
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)
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References
Other 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
Frequently Asked Questions
What is 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)
How do I check if I'm vulnerable to CVE-2026-63855? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.