CVE-2026-23223: xfs: fix UAF in xchk_btree_check_block_owner
In the Linux kernel, the following vulnerability has been resolved:
xfs: fix UAF in xchkbtreecheckblockowner
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 xfsbtnumt.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-23223?
CVE-2026-23223 is categorized as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2026-23223?
To fix CVE-2026-23223, you should upgrade to the latest version of the affected Linux kernel that contains the security patch.
What systems are affected by CVE-2026-23223?
CVE-2026-23223 affects various versions of the Linux kernel including those from Linux and Microsoft azl3 kernel 6.6.121.1-1.
Is CVE-2026-23223 a user-accessible vulnerability?
CVE-2026-23223 could potentially be exploited by attackers with local access to the system, making it a significant concern.
What is the impact of exploiting CVE-2026-23223?
Exploiting CVE-2026-23223 may lead to a use-after-free condition resulting in potential system crashes or unauthorized access.