An issue was discovered in Xen through 4.9.x allowing guest OS users to cause a denial of service (host OS crash) or gain host OS privileges by leveraging incorrect error handling for reference counting in shadow mode.
{ "ubuntu_priority": "medium", "availability": "No subscription required", "binaries": [ { "binary_name": "libxen-4.9", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "libxen-4.9-dbgsym", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "libxen-dev", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "libxenstore3.0", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "libxenstore3.0-dbgsym", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.6-amd64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.6-arm64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.6-armhf", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.7-amd64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.7-arm64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.7-armhf", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.8-amd64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.8-arm64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.8-armhf", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.9-amd64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.9-arm64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-hypervisor-4.9-armhf", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-system-amd64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-system-arm64", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-system-armhf", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-utils-4.9", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-utils-4.9-dbgsym", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xen-utils-common", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xenstore-utils", "binary_version": "4.9.2-0ubuntu1" }, { "binary_name": "xenstore-utils-dbgsym", "binary_version": "4.9.2-0ubuntu1" } ] }