Qemu, when built with VNC display driver support, allows remote attackers to cause a denial of service (arithmetic exception and application crash) via crafted SetPixelFormat messages from a client.
https://bugzilla.redhat.com/show_bug.cgi?id=1289541
https://security.gentoo.org/glsa/201602-01
http://www.debian.org/security/2016/dsa-3469
http://www.debian.org/security/2016/dsa-3470