The Linux kernel before 3.2.2 does not properly restrict SG_IO ioctl calls, which allows local users to bypass intended restrictions on disk read and write operations by sending a SCSI command to (1) a partition block device or (2) an LVM volume.
https://bugzilla.redhat.com/show_bug.cgi?id=752375
http://www.openwall.com/lists/oss-security/2011/12/22/5
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.2
http://secunia.com/advisories/48898
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html