CVE-2026-23223
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
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.
Analysis
Use-after-free vulnerability in Linux kernel XFS subsystem allows local attackers with unprivileged access to cause memory corruption and potential privilege escalation through improper pointer dereferencing in the btree block owner checking function. The flaw stems from attempting to access freed memory due to incorrect temporal ordering of operations when determining cursor aliases. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.
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