Red Hat Security Advisory 2012-0307-03 - The util-linux package contains a large variety of low-level system utilities that are necessary for a Linux system to function. Among others, util-linux contains the fdisk configuration tool and the login program. Multiple flaws were found in the way the mount and umount commands performed mtab file updates. A local, unprivileged user allowed to mount or unmount file systems could use these flaws to corrupt the mtab file and create a stale lock file, preventing other users from mounting and unmounting file systems.
3c4017b188014c2b843ed4e7706c124b342cf978b3416b7b0f193fe2588f8803