Xen through 4.8.x mishandles page transfer, which allows guest OS users to obtain privileged host OS access, aka XSA-217.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "xenstore-utils-dbgsym": "4.4.2-0ubuntu0.14.04.12", "libxenstore3.0": "4.4.2-0ubuntu0.14.04.12", "libxen-4.4": "4.4.2-0ubuntu0.14.04.12", "libxenstore3.0-dbgsym": "4.4.2-0ubuntu0.14.04.12", "libxen-ocaml-dev": "4.4.2-0ubuntu0.14.04.12", "libxen-dev": "4.4.2-0ubuntu0.14.04.12", "xen-utils-4.4-dbgsym": "4.4.2-0ubuntu0.14.04.12", "xen-hypervisor-4.3-amd64": "4.4.2-0ubuntu0.14.04.12", "xen-hypervisor-4.3-armhf": "4.4.2-0ubuntu0.14.04.12", "xen-system-amd64": "4.4.2-0ubuntu0.14.04.12", "xen-hypervisor-4.4-arm64": "4.4.2-0ubuntu0.14.04.12", "libxen-ocaml": "4.4.2-0ubuntu0.14.04.12", "xenstore-utils": "4.4.2-0ubuntu0.14.04.12", "xen-system-armhf": "4.4.2-0ubuntu0.14.04.12", "xen-hypervisor-4.1-amd64": "4.4.2-0ubuntu0.14.04.12", "xen-hypervisor-4.4-armhf": "4.4.2-0ubuntu0.14.04.12", "xen-hypervisor-4.4-amd64": "4.4.2-0ubuntu0.14.04.12", "xen-utils-common": "4.4.2-0ubuntu0.14.04.12", "libxen-ocaml-dbgsym": "4.4.2-0ubuntu0.14.04.12", "xen-utils-4.4": "4.4.2-0ubuntu0.14.04.12", "libxen-4.4-dbgsym": "4.4.2-0ubuntu0.14.04.12", "xen-system-arm64": "4.4.2-0ubuntu0.14.04.12" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "xen-hypervisor-4.6-armhf": "4.6.5-0ubuntu1.2", "libxenstore3.0": "4.6.5-0ubuntu1.2", "xenstore-utils-dbgsym": "4.6.5-0ubuntu1.2", "xen-hypervisor-4.5-armhf": "4.6.5-0ubuntu1.2", "libxenstore3.0-dbgsym": "4.6.5-0ubuntu1.2", "xen-hypervisor-4.5-amd64": "4.6.5-0ubuntu1.2", "xen-utils-4.6": "4.6.5-0ubuntu1.2", "libxen-dev": "4.6.5-0ubuntu1.2", "xen-system-amd64": "4.6.5-0ubuntu1.2", "xen-hypervisor-4.4-arm64": "4.6.5-0ubuntu1.2", "xenstore-utils": "4.6.5-0ubuntu1.2", "xen-system-armhf": "4.6.5-0ubuntu1.2", "xen-utils-common": "4.6.5-0ubuntu1.2", "libxen-4.6": "4.6.5-0ubuntu1.2", "xen-hypervisor-4.4-amd64": "4.6.5-0ubuntu1.2", "xen-hypervisor-4.6-amd64": "4.6.5-0ubuntu1.2", "xen-hypervisor-4.5-arm64": "4.6.5-0ubuntu1.2", "xen-utils-4.6-dbgsym": "4.6.5-0ubuntu1.2", "xen-hypervisor-4.4-armhf": "4.6.5-0ubuntu1.2", "xen-hypervisor-4.6-arm64": "4.6.5-0ubuntu1.2", "libxen-4.6-dbgsym": "4.6.5-0ubuntu1.2", "xen-system-arm64": "4.6.5-0ubuntu1.2" } ] }