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CVE-2026-43191

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Adjust PHY FSM transition to TX_EN-to-PLL_ON for TMDS on DCN35 [Why] A backport of the change made for DCN401…

Published May 6, 2026EPSS 0.16%

Overview

CVE-2026-43191 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Adjust PHY FSM transition to TX_EN-to-PLL_ON for TMDS on DCN35

[Why]

A backport of the change made for DCN401 that addresses an issue where

we turn off the PHY PLL when disabling TMDS output, which causes the

OTG to remain stuck.

The OTG being stuck can lead to a hang in the DCHVM's ability to ACK

invalidations when it thinks the HUBP is still on but it's not receiving

global sync.

The transition to PLL_ON needs to be atomic as there's no guarantee

that the thread isn't pre-empted or is able to complete before the

IOMMU watchdog times out.

[How]

Backport the implementation from dcn401 back to dcn35.

There's a functional difference in when the eDP output is disabled in

dcn401 code so we don't want to utilize it directly.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/75372d75a4e23783583998ed99d5009d555850daRefgit.kernel.org/stable/c/d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43191?

CVE-2026-43191 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43191?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43191?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43191?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43191 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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