CVE-2026-43305 drm/amd/display: Fix mismatched unlock for DMUB HW lock in HWSS fast path

What is CVE-2026-43305?

CVE-2026-43305 is a medium-severity vulnerability in Linux kernel, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-667

Which versions are affected by CVE-2026-43305?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43305?

Apply the vendor's patch.

Is CVE-2026-43305 being exploited?

There is no known exploitation of CVE-2026-43305 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-86172, GHSA-99gr-cw2x-89qp, ROOT-OS-UBUNTU-2204-CVE-2026-43305, ROOT-OS-UBUNTU-2404-CVE-2026-43305, UBUNTU-CVE-2026-43305.