CVE-2026-43187

A flaw was found in the Linux kernel's XFS filesystem. Incorrect handling of freemap entries when deleting attribute leaf freemap entries can lead to a situation where zero-length freemap entries with a non-zero base are left behind. Subsequent setxattr operations can cause these entries to overlap with other freemap entries. This can result in the allocation of extended attribute (xattr) name-value entries on top of existing data, leading to data loss.

Red Hat acknowledges the upstream Linux kernel correction for «xfs» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the xfs module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.