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Linux Kernel CVE-2026-43305

| EUVDEUVD-2026-28575 MEDIUM
Improper Locking (CWE-667)
2026-05-08 Linux GHSA-99gr-cw2x-89qp
Amd Linux Information Disclosure Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
May 15, 2026 - 13:37 vuln.today
CVSS changed
May 15, 2026 - 13:37 NVD
5.5 (MEDIUM)
Patch available
May 08, 2026 - 14:33 EUVD
CVE Published
May 08, 2026 - 13:11 nvd
MEDIUM 5.5
CVE Published
May 08, 2026 - 13:11 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

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.

AnalysisAI

Denial of service via system hang in Linux kernel's AMD display driver occurs when the DMUB hardware lock evaluation mismatches between lock acquisition and release in the HWSS fast path, affecting ASIC variants without FAMS support. Local authenticated attackers can trigger this condition through display operations, causing a hang with high availability impact. Patch available in stable releases 6.19.6 and 7.0; EPSS score of 0.02% indicates low real-world exploitation probability despite KEV status.

Technical ContextAI

The vulnerability resides in the AMD Display (DRM/amd/display) subsystem of the Linux kernel, specifically in the Hardware Sequencer (HWSS) fast path handling of DMUB (Display Microcontroller Unit) hardware locking. The DMUB is a microcontroller that manages display operations on AMD GPUs. The root cause is a logic mismatch in CWE-667 (Improper Locking) where the condition to acquire the DMUB HW lock differs from the condition to release it. This occurs in ASIC designs that lack FAMS (Fully Automated Memory Switching) support, where the fast path optimization path does not properly synchronize lock state. The fix introduces a stored flag to ensure consistent lock/unlock semantics across the code path.

RemediationAI

Apply kernel security update to version 6.19.6 (6.x stable series) or 7.0 (7.x stable series) via standard package management (apt, yum, etc.) or direct kernel compilation from upstream git repository using commits 4e387ad67efb100b645630ffbce7716786f52283 or af3303970da5ce5bfe6dffdd07f38f42aad603e0. For distributions not yet providing patched packages, compile a custom kernel from the stable repository at git.kernel.org/stable using the referenced commit hashes. No workarounds are available short of disabling the HWSS fast path optimization or avoiding display driver operations that trigger the condition; such workarounds carry significant performance cost for AMD graphics operations. Verify patch application by checking kernel version post-reboot and confirming the fix commit is present in dmesg or git log.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-43305 vulnerability details – vuln.today
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