CVE-2026-23223

xfs: fix UAF in xchk_btree_check_block_owner

Published: 2/18/2026 Last updated: 5/11/2026 Reserved: 1/13/2026

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.

CNA assigner: Linux (416baaa9-dc9f-4396-8d5f-8c081fb06d67) Requested by: n/a

Opam packages affected (29)

albatross cdrom conf-bpftool conf-libbpf conf-linux-libc-dev core core_unix hvsock mirage-block-unix mm ocaml-probes ortools_solvers orun rawlink rawlink-eio rawlink-lwt restricted shell solo5 solo5-bindings-hvt solo5-bindings-spt solo5-cross-aarch64 solo5-kernel-ukvm tracy-client tuntap uring vhd-format vhd-format-lwt xapi-stdext-unix

Products affected (4)

Product	Vendor	Version
Linux	Linux	6.3.10 and earlier
Linux	Linux	< 52.9
Linux	Linux	n/a
Linux	Linux	n/a

CVE-2026-23223

xfs: fix UAF in xchk_btree_check_block_owner

Opam packages affected (29)

Products affected (4)

References (8)