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CVE-2026-43163

4.7 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: md/bitmap: fix GPF in write_page caused by resize race A General Protection Fault occurs in write_page() during array resize: R…

Published May 6, 2026CWE-362EPSS 0.09%

Overview

CVE-2026-43163 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, 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:

md/bitmap: fix GPF in write_page caused by resize race

A General Protection Fault occurs in write_page() during array resize:

RIP: 0010:write_page+0x22b/0x3c0 [md_mod]

This is a use-after-free race between bitmap_daemon_work() and

__bitmap_resize(). The daemon iterates over `bitmap->storage.filemap`

without locking, while the resize path frees that storage via

md_bitmap_file_unmap(). `quiesce()` does not stop the md thread,

allowing concurrent access to freed pages.

Fix by holding `mddev->bitmap_info.mutex` during the bitmap update.

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/140cc839fbeb1ddb33a8da8811b716d88d3905b7Refgit.kernel.org/stable/c/46ef85f854dfa9d5226b3c1c46493d79556c9589Refgit.kernel.org/stable/c/5f73c8b33df9a605a591eab72d43a969600c1f8cRefgit.kernel.org/stable/c/9a6f8cd28bb9bb6ed86a6df19331fb08016dee7fRefgit.kernel.org/stable/c/a437e3bf30e32846079e470c1ba5ee790bccdf89Refgit.kernel.org/stable/c/d3af62411e19752c663fe4f424dbf49d95a4cc7cRefgit.kernel.org/stable/c/d92b8fac294b5f915c50e65ce4ae2262e53614ecRefgit.kernel.org/stable/c/ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43163?

CVE-2026-43163 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2026-43163?

This vulnerability has a CVSS 3.1 base score of 4.7, 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-2026-43163?

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-2026-43163?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43163 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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