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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-23223

xfs: fix UAF in xchk_btree_check_block_ownerCVE-2026-23223

Answer in brief

CVE-2026-23223 records a Unknown severity vulnerability in xfs: fix UAF in xchk_btree_check_block_owner. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Feb 18, 2026Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=ec793e690f801d97a7ae2a0d429fea1fee4d44aa <1d411278dda293a507cb794db7d9ed3511c685c6 || >=ec793e690f801d97a7ae2a0d429fea1fee4d44aa <ed82e7949f5cac3058f4100f3cd670531d41a266 || >=ec793e690f801d97a7ae2a0d429fea1fee4d44aa <ba5264610423d9653aa36920520902d83841bcfd || >=ec793e690f801d97a7ae2a0d429fea1fee4d44aa <1c253e11225bc5167217897885b85093e17c22171d411278dda293a507cb794db7d9ed3511c685c6, ed82e7949f5cac3058f4100f3cd670531d41a266, ba5264610423d9653aa36920520902d83841bcfd, 1c253e11225bc5167217897885b85093e17c2217
Linux/Linuxgeneric6.9Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 1d411278dda293a507cb794db7d9ed3511c685c6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Feb 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 5, 2026
References
4 linked sources
Open source record