SEPTEMBER 8, 2026
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Case File

CVE-2026-63855

HIGH · CVSS 7.8 EPSS 0.12%

Source: NVD + CISA KEV + EPSS · Published 2026-07-19 · Last synced 2026-08-18

CyberRota Analysis

AI-Generated

The vulnerability affects the Linux kernel's AMD GPU (amdgpu) driver, specifically the Video Codec Network (VCN) encoder and decoder rings, which improperly handle 64-bit user fence writes. This flaw can lead to denial of service by rejecting command submissions that utilize user fences, potentially impacting system stability and performance. Organizations utilizing Linux systems with AMD GPUs should prioritize patching to mitigate the risk of exploitation.

CVE
CVE-2026-63855
Severity
HIGH
CVSS
7.8
EPSS
0.12%
Linux

Original NVD 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)