CVE-2026-63853
Received Received - Intake

AMDGPU VCN Encoder Ring User Fence Write Vulnerability

Publication date: 2026-07-19

Last updated on: 2026-07-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v4.0 enc ring VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit fd852c048b46f9825e904a4f3f4538fe9d8827d9)

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Meta Information

Published
2026-07-19
Last Modified
2026-07-19
Generated
2026-07-20
AI Q&A
2026-07-19
EPSS Evaluated
N/A
NVD
CVE-2026-63853
EUVD
EUVD-2026-45537

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves the AMDGPU VCN (Video Core Next) component. The issue is that VCN encoder and decoder rings do not support 64-bit user fence writes, which could lead to improper handling of fence operations in graphics processing.

Detection Guidance

This vulnerability is specific to the Linux kernel's AMD GPU driver (amdgpu) and relates to VCN encoder/decoder rings. Detection requires checking kernel logs for related errors or examining kernel configurations. Commands like dmesg | grep amdgpu or journalctl -k | grep amdgpu may help identify issues.

Impact Analysis

This vulnerability may cause graphics-related crashes or instability in systems using AMD GPUs with VCN v4.0. It could lead to application failures or system hangs during video encoding or decoding tasks.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a Linux kernel issue related to AMD GPU VCN encoder/decoder rings rejecting CS submissions with user fences due to lack of 64-bit support.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for this issue. Monitor kernel logs for amdgpu-related errors after updating. If using a custom kernel, ensure the patch from commit fd852c048b46f9825e904a4f3f4538fe9d8827d9 is applied.

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