Xen, when used on a system providing PV backends, allows local guest OS administrators to cause a denial of service (host OS crash) or gain privileges by writing to memory shared between the frontend and backend, aka a double fetch vulnerability.Referenceshttp://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmlhttp://www.debian.org/security/2016/dsa-3519http://www.securityfocus.com/bid/79592http://xenbits.xen.org/xsa/advisory-155.htmlhttp://lists.opensuse.org/opensuse-security-announce/2016-07/msg00005.htmlhttp://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.htmlhttp://www.securitytracker.com/id/1034479https://security.gentoo.org/glsa/201604-03http://www.debian.org/security/2016/dsa-3471http://www.debian.org/security/2016/dsa-3434http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
