A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.
https://access.redhat.com/security/cve/CVE-2021-4155
https://www.openwall.com/lists/oss-security/2022/01/10/1