An issue was discovered in Xen through 4.9.x allowing x86 SVM PV guest OS users to cause a denial of service (hypervisor crash) or gain privileges because IDT settings are mishandled during CPU hotplugging.Referenceshttps://lists.debian.org/debian-lts-announce/2018/10/msg00021.htmlhttps://xenbits.xen.org/xsa/advisory-244.htmlhttps://www.debian.org/security/2017/dsa-4050https://support.citrix.com/article/CTX228867https://security.gentoo.org/glsa/201801-14http://www.securitytracker.com/id/1039568
