The ARM GIC distributor virtualization in Xen 4.4.x and 4.5.x allows local guests to cause a denial of service by causing a large number messages to be logged.
http://xenbits.xen.org/xsa/advisory-118.html
http://www.securitytracker.com/id/1031663
http://www.securityfocus.com/bid/72766
http://www.openwall.com/lists/oss-security/2015/01/29/9
http://lists.fedoraproject.org/pipermail/package-announce/2015-March/152776.html