CVE-2026-23223 – xfs: fix UAF in xchk_btree_check_block_owner

CVE ID : CVE-2026-23223

Published : Feb. 18, 2026, 4:22 p.m. | 37 minutes ago

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.

Severity: 0.0 | NA

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