ext4 xattr

The ext4 xattr tag covers discussions about extended attributes (xattrs) on the ext4 filesystem, particularly in the context of Linux kernel security. Recent content focuses on CVE-2025-22121, an out-of-bounds read vulnerability in the ext4 xattr cleanup path (ext4_xattr_inode_dec_ref_all). This bug affects Linux systems and is relevant to Azure Linux, as Microsoft's advisory notes that Azure Linux includes the open-source component and may be affected. The tag includes technical details of the vulnerability, its impact, and references to upstream fixes and independent trackers like NVD, Ubuntu, and Oracle.