Off-by-one error in the cmd_smart function in the smart self test in hw/ide/core.c in QEMU before 2.0 allows local users to have unspecified impact via a SMART EXECUTE OFFLINE command that triggers a buffer underflow and memory corruption.
https://lists.nongnu.org/archive/html/qemu-devel/2014-04/msg02152.html
https://lists.nongnu.org/archive/html/qemu-devel/2014-04/msg02095.html
https://lists.nongnu.org/archive/html/qemu-devel/2014-04/msg02016.html
http://www.ubuntu.com/usn/USN-2182-1
http://www.securityfocus.com/bid/66932
http://www.openwall.com/lists/oss-security/2014/04/18/5
http://www.openwall.com/lists/oss-security/2014/04/15/4
http://secunia.com/advisories/58191
http://secunia.com/advisories/57945
http://rhn.redhat.com/errata/RHSA-2014-0744.html