---
id: CVE-2026-43305
title: 'drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path'
summary: |-
  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…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7d041982fe11fff29b32a09228c4d52f159b56ad <
    4e387ad67efb100b645630ffbce7716786f52283
  - >-
    Linux >= 7d041982fe11fff29b32a09228c4d52f159b56ad <
    af3303970da5ce5bfe6dffdd07f38f42aad603e0
  - Linux 6.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:34:51.818525Z'
published: '2026-05-08'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:42:47.470Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43305'
references:
  - url: 'https://git.kernel.org/stable/c/4e387ad67efb100b645630ffbce7716786f52283'
  - url: 'https://git.kernel.org/stable/c/af3303970da5ce5bfe6dffdd07f38f42aad603e0'
tags:
  - cve.org
epss: 0.00083
epssPercentile: 0.00223
ingestedAt: '2026-11-06T15:54:03.943Z'
---

## Overview

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.

## Affected

- `Linux >= 7d041982fe11fff29b32a09228c4d52f159b56ad < 4e387ad67efb100b645630ffbce7716786f52283`
- `Linux >= 7d041982fe11fff29b32a09228c4d52f159b56ad < af3303970da5ce5bfe6dffdd07f38f42aad603e0`
- `Linux 6.19`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.