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CVE-2026-45915

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: fat: avoid parent link count underflow in rmdir Corrupted FAT images can leave a directory inode with an incorrect i_nlink (e.g.

Published May 27, 2026EPSS 0.16%

Overview

CVE-2026-45915 is a medium-severity vulnerability. It was published on May 27, 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:

fat: avoid parent link count underflow in rmdir

Corrupted FAT images can leave a directory inode with an incorrect

i_nlink (e.g. 2 even though subdirectories exist). rmdir then

unconditionally calls drop_nlink(dir) and can drive i_nlink to 0,

triggering the WARN_ON in drop_nlink().

Add a sanity check in vfat_rmdir() and msdos_rmdir(): only drop the

parent link count when it is at least 3, otherwise report a filesystem

error.

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/17866f8a0822d414cb02e621cf003a7d04396ef8Refgit.kernel.org/stable/c/7fe0de287e931e07cb96ecf1f449b2ebdb0e1115Refgit.kernel.org/stable/c/8cafcb881364af5ef3a8b9fed4db254054033d8aRefgit.kernel.org/stable/c/955c5d670b5ae07c78f4345e23a895638db96ce1Refgit.kernel.org/stable/c/9894c79fd9466612d0514be157b5c30cd93aa645Refgit.kernel.org/stable/c/cd569b87378b9c33ae13c23d6bb9d205d66f7c4bRefgit.kernel.org/stable/c/d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0Refgit.kernel.org/stable/c/d3b7ffa90f613938128432c7b2f35b7aa4bdd86b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45915?

CVE-2026-45915 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-45915?

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-2026-45915?

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-2026-45915?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45915 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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