Xen through 4.8.x allows local x86 PV guest OS kernel administrators to cause a denial of service (host hang or crash) by modifying the instruction stream asynchronously while performing certain kernel operations.Referenceshttps://security.gentoo.org/glsa/201612-56http://xenbits.xen.org/xsa/advisory-202.htmlhttp://www.securityfocus.com/bid/95021http://www.debian.org/security/2017/dsa-3847http://www.securitytracker.com/id/1037517https://support.citrix.com/article/CTX219378
