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Linux Kernel CVE-2026-43243

| EUVDEUVD-2026-27802 MEDIUM
2026-05-06 Linux GHSA-wff9-vm6f-fgv2
Denial Of Service Amd Linux 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

4
Analysis Generated
May 11, 2026 - 14:22 vuln.today
CVSS changed
May 11, 2026 - 14:22 NVD
5.5 (MEDIUM)
Patch available
May 06, 2026 - 13:32 EUVD
CVE Published
May 06, 2026 - 11:28 nvd
MEDIUM 5.5

DescriptionCVE.org

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

drm/amd/display: Add signal type check for dcn401 get_phyd32clk_src

Trying to access link enc on a dpia link will cause a crash otherwise

AnalysisAI

A denial of service vulnerability in the Linux kernel's AMD display driver (drm/amd/display) allows local authenticated users to crash the system by accessing link encoder functionality on DisplayPort over USB-C (DPIA) links without proper signal type validation. The vulnerability affects kernel versions before the patches released in stable branches 6.12.75, 6.18.16, 6.19.6, and 7.0. No public exploit code has been identified, and real-world exploitation probability is very low (EPSS 0.02%), suggesting this is primarily an edge-case denial of service affecting specific hardware configurations with DPIA displays.

Technical ContextAI

The vulnerability resides in the AMD Display Core Next (DCN) 401 display driver's get_phyd32clk_src function within the Linux kernel's Direct Rendering Manager (DRM) subsystem. The root cause is a missing signal type validation check before attempting to access link encoder structures on DPIA (DisplayPort over USB-C) connections. When the driver tries to retrieve PHY D32 clock source information without verifying the link's signal type, it may dereference invalid memory or attempt operations on incompatible link types, triggering a kernel crash. The affected code path involves the display controller's clock and signal routing logic, specifically in AMD's DCN 401 variant which is used in recent RDNA and RDNA 2 era GPUs with USB-C display output support.

RemediationAI

Upgrade to patched kernel versions: Linux 6.12.75, 6.18.16, 6.19.6, or 7.0 depending on your distribution's supported branch. For immediate patching, check your distribution's kernel repository-most major distributions (Ubuntu, Debian, Fedora, RHEL) have already backported these fixes. To verify your kernel version, run 'uname -r' and compare against the patched versions listed above. If immediate upgrade is not feasible, the vulnerability only manifests with AMD DPIA (DisplayPort over USB-C) displays connected to RDNA-era GPUs; if your system does not use this specific display configuration, risk is eliminated. No functionality is lost by applying this patch-it only adds a missing validation check without changing driver behavior for correctly configured systems. Refer to the upstream Linux kernel commits (available at git.kernel.org/stable/) for patch details, or contact your Linux distribution's support for backported kernel updates.

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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-2026-43243 vulnerability details – vuln.today
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