CVE-2026-23223
HIGH severity · CVSS 7.8 · Use-after-free
7.8CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/1c253e11225bc5167217897885b85093e17c2217 ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/1c253e11225bc5167217897885b85093e17c2217Patch
- https://git.kernel.org/stable/c/1d411278dda293a507cb794db7d9ed3511c685c6Patch
- https://git.kernel.org/stable/c/ba5264610423d9653aa36920520902d83841bcfdPatch
- https://git.kernel.org/stable/c/ed82e7949f5cac3058f4100f3cd670531d41a266Patch