🛡️ CVE-2026-43191 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-43191 is recorded against 3 packages.

  • kernel (from 6.7.0 up to 6.19.6)
  • linux-kernel (from 6.7 up to 6.19.6)
  • unknown

Timeline and source

Published on 6 May 2026 and last revised on 28 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-43191 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-06
Updated 2026-08-12
Modified 2026-07-28

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.19.6
linux-kernel 6.7 6.19.6
unknown — —

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