CVE-2025-22120 is a medium severity vulnerability in the Linux kernel's ext4 filesystem code. It occurs in the ext4_setattr() function where an error path does not properly unlock a mapping invalidate lock, leading to a hung task condition. This can cause processes to block indefinitely, impacting system availability. The issue arises if ext4_inode_attach_jinode() fails, preventing filemap_invalidate_unlock() from being called. The vulnerability does not affect confidentiality or integrity but results in denial of service due to task hangs.