CVE-2026-63851
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 v4.0.5 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 084d94ac93707bdda07efb5cee786f632de4219b)

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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-2026-63851
EUVD
EUVD-2026-45535

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel to 4.0.5 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel affects AMDGPU's Video Core Next (VCN) component. It involves encoder and decoder rings not supporting 64-bit user fence writes, which could lead to issues when processing certain command submissions.

Detection Guidance

This vulnerability is specific to the Linux kernel's AMD GPU driver (amdgpu) and VCN (Video Core Next) components. Detection requires checking kernel logs for related errors or examining driver configurations. Commands like dmesg | grep amdgpu or journalctl -k | grep amdgpu may help identify issues. Ensure your kernel version includes the fix.

Impact Analysis

If exploited, this could allow attackers to cause denial-of-service conditions or potentially execute arbitrary code on affected systems by submitting malicious command streams to the VCN component.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is specific to the Linux kernel's AMD GPU driver (VCN encoder/decoder rings) and involves user fence write limitations rather than data privacy or security controls.

Mitigation Strategies

Update the Linux kernel to a version that includes the fix for this vulnerability. Check with your distribution vendor for available patches. Monitor AMD GPU driver updates for VCN encoder and decoder ring support.

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