CVE-2026-63853
kernel: drm/amdgpu/vcn: set no_user_fence for VCN v4.0 enc ring
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 19, 2026
Updated · August 22, 2026
Description
A flaw was found in the Linux kernel's AMD GPU Video Core Next (VCN) driver. This vulnerability arises because the VCN encoder and decoder rings, responsible for video processing, do not support 64-bit user fence writes. An attacker could exploit this by submitting command requests that include these unsupported user fences. This would result in the system rejecting the submissions, potentially leading to a denial of service for specific video processing functionalities.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-1287 · Improper Validation of Specified Type of Input