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Vulnerability record · CVE-2026-31455 · published 22 April 2026

CVE-2026-31455: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/239d734c00644072862fa833805c4471573b1445 Patch
https://git.kernel.org/stable/c/4f24a767e3d64a5f58c595b5c29b6063a201f1e3 Patch
https://git.kernel.org/stable/c/558e3275d8a3b101be18a7fe7d1634053e9d9b07 Patch
https://git.kernel.org/stable/c/8147e304d7d32fd5c3e943babc296ce2873dc279 Patch
https://git.kernel.org/stable/c/a89434a6188d8430ea31120da96e3e4cefb58686 Patch
https://git.kernel.org/stable/c/bda27fc0b4eb3a425d9a18475c4cb94fbe862c60 Patch
https://git.kernel.org/stable/c/d38135af04a3ad8a585c899d176efc8e97853115 Patch
https://git.kernel.org/stable/c/e6cc490048f78b009259a5f032acead9f789c34c Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31455), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.