CVE-2026-63855
kernel: drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 19, 2026
Updated · August 1, 2026
Description
A flaw was found in the Linux kernel's AMDGPU Video Core Next (VCN) driver. The VCN encoder and decoder rings do not support 64-bit user fence writes. A local attacker could exploit this by submitting commands with unsupported 64-bit user fences, which could lead to system instability or a denial of service (DoS).
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