Use After Free Vulnerability in Linux Kernel's XFS Filesystem
CVE-2026-23223

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 18 February 2026

What is CVE-2026-23223?

A use after free vulnerability exists in the XFS filesystem of the Linux kernel that leads to a potential mishandling of memory references. Specifically, the issue arises in the xchk_btree_check_block_owner function where the dereferencing of 'bs->cur' can occur after the associated structures have been freed. This flaw can be exploited due to improper temporal ordering following the removal of the 'xfs_btnum_t', posing risks to system stability and security. A fix has been implemented to ensure that sampling occurs before any freeing of objects, thereby preventing this vulnerability from being exploited.

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