CVE-2026-23223

HIGH

Linux Kernel < 6.12.72, 6.13.0-6.18.10, 6.19.0, 6.9.0-6.12.71 - Use-After-Free in xfs_btree_check_block_owner

Title source: llm
STIX 2.1

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.

References (4)

Core 4

Scores

CVSS v3 7.8
EPSS 0.0002
EPSS Percentile 4.9%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-416
Status published
Products (16)
linux/Kernel < 6.12.72linux
linux/Kernel 6.13.0 - 6.18.11linux
linux/Kernel 6.19.0 - 6.19.1linux
linux/Kernel 6.9.0 - 6.12.72linux
Linux/Linux < 6.9
Linux/Linux 6.12.72 - 6.12.*
Linux/Linux 6.18.11 - 6.18.*
Linux/Linux 6.19.1 - 6.19.*
Linux/Linux 6.9
Linux/Linux 7.0
... and 6 more
Published Feb 18, 2026
Tracked Since Feb 18, 2026