CVE-2026-43305
Received Received - Intake
AMD Display Driver DMUB Lock Mismatch Vulnerability

Publication date: 2026-05-08

Last updated on: 2026-05-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path [Why] The evaluation for whether we need to use the DMUB HW lock isn't the same as whether we need to unlock which results in a hang when the fast path is used for ASIC without FAMS support. [How] Store a flag that indicates whether we should use the lock and use that same flag to specify whether unlocking is needed.
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Meta Information
Published
2026-05-08
Last Modified
2026-05-08
Generated
2026-06-19
AI Q&A
2026-05-08
EPSS Evaluated
2026-06-18
NVD
CVE-2026-43305
EUVD
EUVD-2026-28575
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux kernel *
linux linux_kernel *
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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 exists in the Linux kernel within the drm/amd/display component. It involves a mismatched unlock operation for the DMUB hardware lock in the HWSS fast path. Specifically, the condition used to decide whether to use the DMUB hardware lock is different from the condition used to decide whether to unlock it. This mismatch can cause the system to hang when the fast path is used on ASICs that do not support FAMS.

The fix involves storing a flag that indicates whether the lock should be used and then using that same flag to determine if unlocking is necessary, ensuring consistency and preventing the hang.

Impact Analysis

This vulnerability can cause the system to hang when the fast path is used on certain AMD hardware (ASICs without FAMS support). A system hang can lead to denial of service, interrupting normal operations and potentially requiring a reboot to recover.

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