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Linux Kernel AMDGPU JPEG V4.0 Ring User Fence Vulnerability

Vulnerability

A vulnerability in the Linux kernel's AMDGPU JPEG V4.0 ring has been addressed. JPEG rings do not accommodate 64-bit user fence writes, leading to the rejection of command stream submissions that include user fences. This issue has been resolved by setting the 'no_user_fence' attribute for the JPEG V4.0 ring, preventing the use of user fences in a way that could cause compatibility issues.

Impact

The vulnerability could lead to improper handling of user fence writes, potentially causing issues in command stream processing for JPEG V4.0 operations.

Reproduction

The vulnerability can be reproduced by attempting to submit a command stream to a JPEG V4.0 ring with a 64-bit user fence. The submission will be rejected due to the ring's inability to process such user fence writes.

Remediation

Users can update to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the Linux kernel official website.

Added: Jul 19, 2026, 3:38 PM
Updated: Jul 19, 2026, 3:38 PM

Vulnerability Rating

Custom Algorithm
spread
9.0
impact
0.6
exploitability
3.9
remediation
7.7
relevance
9.7
threat
4.8
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.