The Intel VT-d Interrupt Remapping engine in Xen 3.3.x through 4.3.x allows local guests to cause a denial of service (kernel panic) via a malformed Message Signaled Interrupt (MSI) from a PCI device that is bus mastering capable that triggers a System Error Reporting (SERR) Non-Maskable Interrupt (NMI).
https://security.gentoo.org/glsa/201504-04
http://www.securitytracker.com/id/1028931
http://www.securityfocus.com/bid/61854
http://www.openwall.com/lists/oss-security/2013/08/20/8
http://secunia.com/advisories/54341
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00005.html