Integer overflow in the VGA module in QEMU allows local guest OS users to cause a denial of service (out-of-bounds read and QEMU process crash) by editing VGA registers in VBE mode.
https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg01196.html
http://xenbits.xen.org/xsa/advisory-179.html
http://www.ubuntu.com/usn/USN-2974-1
http://www.securitytracker.com/id/1035794
http://www.securityfocus.com/bid/90314
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
http://www.openwall.com/lists/oss-security/2016/05/09/4
http://www.debian.org/security/2016/dsa-3573
http://support.citrix.com/article/CTX212736