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CVE-2026-31455

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: xfs: stop reclaim before pushing AIL during unmount The unmount sequence in xfs_unmount_flush_inodes() pushed the AIL while bac…

Published Apr 22, 2026CWE-416EPSS 0.17%

Overview

CVE-2026-31455 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

xfs: stop reclaim before pushing AIL during unmount

The unmount sequence in xfs_unmount_flush_inodes() pushed the AIL while

background reclaim and inodegc are still running. This is broken

independently of any use-after-free issues - background reclaim and

inodegc should not be running while the AIL is being pushed during

unmount, as inodegc can dirty and insert inodes into the AIL during the

flush, and background reclaim can race to abort and free dirty inodes.

Reorder xfs_unmount_flush_inodes() to stop inodegc and cancel background

reclaim before pushing the AIL. Stop inodegc before cancelling

m_reclaim_work because the inodegc worker can re-queue m_reclaim_work

via xfs_inodegc_set_reclaimable.

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/239d734c00644072862fa833805c4471573b1445Refgit.kernel.org/stable/c/4f24a767e3d64a5f58c595b5c29b6063a201f1e3Refgit.kernel.org/stable/c/558e3275d8a3b101be18a7fe7d1634053e9d9b07Refgit.kernel.org/stable/c/8147e304d7d32fd5c3e943babc296ce2873dc279Refgit.kernel.org/stable/c/a89434a6188d8430ea31120da96e3e4cefb58686Refgit.kernel.org/stable/c/bda27fc0b4eb3a425d9a18475c4cb94fbe862c60Refgit.kernel.org/stable/c/d38135af04a3ad8a585c899d176efc8e97853115Refgit.kernel.org/stable/c/e6cc490048f78b009259a5f032acead9f789c34c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31455?

CVE-2026-31455 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31455?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31455?

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-2026-31455?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31455 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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