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Vulnerability record · CVE-2026-23223 · published 18 February 2026

CVE-2026-23223: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: xfs: fix UAF in xchk_btree_check_block_owner We cannot dereference bs->cur when trying to determine if bs->cur aliases bs->sc->sa.{bno,rmap}_cur after the latter has been freed. Fix this by sampling before type before any freeing could happen. The correct temporal ordering was broken when we removed xfs_btnum_t.

7.8 CVSS 3.1 High EPSS 0.13% · top 98.1% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: xfs: fix UAF in xchk_btree_check_block_owner We cannot dereference bs->cur when trying to determine if bs->cur aliases bs->sc->sa.{bno,rmap}_cur after the latter has been freed. Fix this by sampling before type before any freeing could happen. The correct temporal ordering was broken when we removed xfs_btnum_t.

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/1c253e11225bc5167217897885b85093e17c2217 Patch
https://git.kernel.org/stable/c/1d411278dda293a507cb794db7d9ed3511c685c6 Patch
https://git.kernel.org/stable/c/ba5264610423d9653aa36920520902d83841bcfd Patch
https://git.kernel.org/stable/c/ed82e7949f5cac3058f4100f3cd670531d41a266 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23223), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.