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CVE-2026-43381

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: nouveau/dpcd: return EBUSY for aux xfer if the device is asleep If we have runtime suspended, and userspace wants to use /dev/d…

Published May 8, 2026EPSS 0.16%

Overview

CVE-2026-43381 is a medium-severity vulnerability. It was published on May 8, 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:

nouveau/dpcd: return EBUSY for aux xfer if the device is asleep

If we have runtime suspended, and userspace wants to use /dev/drm_dp_*

then just tell it the device is busy instead of crashing in the GSP

code.

WARNING: CPU: 2 PID: 565741 at drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/rpc.c:164 r535_gsp_msgq_wait+0x9a/0xb0 [nouveau]

CPU: 2 UID: 0 PID: 565741 Comm: fwupd Not tainted 6.18.10-200.fc43.x86_64 #1 PREEMPT(lazy)

Hardware name: LENOVO 20QTS0PQ00/20QTS0PQ00, BIOS N2OET65W (1.52 ) 08/05/2024

RIP: 0010:r535_gsp_msgq_wait+0x9a/0xb0 [nouveau]

This is a simple fix to get backported. We should probably engineer a

proper power domain solution to wake up devices and keep them awake

while fw updates are happening.

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/178df7c91e6c202579284df9f79d1592a514cdcfRefgit.kernel.org/stable/c/24639553a016578222ac597db924dfb6fa5ec8b5Refgit.kernel.org/stable/c/4df518aa196085909fd7e32518ecd27fba60ed69Refgit.kernel.org/stable/c/6bdd2d70c338d52c387d3b3aadc596784ae81b01Refgit.kernel.org/stable/c/8f3c6f08ababad2e3bdd239728cf66a9949446b4Refgit.kernel.org/stable/c/ad8fa5bff53f5d1f8394f996850da8ce070eaee3Refgit.kernel.org/stable/c/cd24cab2023aa46b595bc6b9cc39d8973d9d0a8cRefgit.kernel.org/stable/c/fad178ae894930520519ead3c8e0150641466360

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43381?

CVE-2026-43381 is a medium-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43381?

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-2026-43381?

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-2026-43381?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43381 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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