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.
git.qemu-project.org/?p=qemu.git%3Ba=commitdiff%3Bh=4c65fed8bdf96780735dbdb92a8
www.debian.org/security/2016/dsa-3469
www.debian.org/security/2016/dsa-3470
www.debian.org/security/2016/dsa-3471
www.openwall.com/lists/oss-security/2015/12/08/7
www.securityfocus.com/bid/78708
bugzilla.redhat.com/show_bug.cgi?id=1289541
security.gentoo.org/glsa/201602-01