CVE-2026-43191 Details
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.
A vulnerability exists in the Linux kernel's AMD display driver for the DCN35 architecture. The issue arises from improper management of the PHY state when disabling TMDS output, leading to a condition where the OTG remains stuck. This can disrupt the DCHVM's ability to acknowledge invalidations, causing synchronization issues. The vulnerability has been addressed by backporting a fix from the DCN401 implementation, ensuring that the transition to enabling the PHY PLL is handled atomically to prevent timing out issues with the IOMMU watchdog.
Users can apply the patch available in the Linux kernel stable tree to address this vulnerability. The patch can be downloaded as part of the Linux kernel snapshot corresponding to the commit ID 'd1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51'.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/75372d75a4e23783583998ed99d5009d555850da | kernel.org | Patch |
| https://git.kernel.org/stable/c/d1f7ceb00e8956ff6d183b7b45ef4e73c96f4c51 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.7, < 6.19.6 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 11, 2026 | Initial Analysis | [email protected] |
| May 6, 2026 | New CVE Received | kernel.org |