CVE-2026-43187

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the XFS file system where a small freemap at the end of the xattr entries array can experience a size underflow during array expansion. This can result in zero-length freemap entries with a nonzero base. While the leaf add function ignores zero-size entries, a separate bug in the freemap update code within leaf add() fails to update entries that begin midway through a newly appended xattr entry. This can lead to the freemap containing two entries with the same base but different sizes, potentially causing leaf add() to allocate xattr namevalue entries on top of the entries array, which results in data loss.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.