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CVE-2026-43045

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: mshv: Fix error handling in mshv_region_pin The current error handling has two issues: First, pin_user_pages_fast() can return…

Published May 1, 2026EPSS 0.16%

Overview

CVE-2026-43045 is a medium-severity vulnerability. It was published on May 1, 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:

mshv: Fix error handling in mshv_region_pin

The current error handling has two issues:

First, pin_user_pages_fast() can return a short pin count (less than

requested but greater than zero) when it cannot pin all requested pages.

This is treated as success, leading to partially pinned regions being

used, which causes memory corruption.

Second, when an error occurs mid-loop, already pinned pages from the

current batch are not properly accounted for before calling

mshv_region_invalidate_pages(), causing a page reference leak.

Treat short pins as errors and fix partial batch accounting before

cleanup.

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/a7d149152bc5a9119854331c57be35ad31fdf5ccRefgit.kernel.org/stable/c/c0e296f257671ba10249630fe58026f29e4804d9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43045?

CVE-2026-43045 is a medium-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43045?

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-2026-43045?

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-2026-43045?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43045 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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