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CVE-2026-23223

7.8 · HIGH

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->…

Published Feb 18, 2026CWE-416EPSS 0.14%

Overview

CVE-2026-23223 is a high-severity vulnerability. It was published on February 18, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1c253e11225bc5167217897885b85093e17c2217Refgit.kernel.org/stable/c/1d411278dda293a507cb794db7d9ed3511c685c6Refgit.kernel.org/stable/c/ba5264610423d9653aa36920520902d83841bcfdRefgit.kernel.org/stable/c/ed82e7949f5cac3058f4100f3cd670531d41a266

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23223?

CVE-2026-23223 is a high-severity vulnerability. It was published on February 18, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23223?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23223?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-23223?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23223 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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