This update for xen fixes several issues.
These security issues were fixed:
{
    "binaries": [
        {
            "xen-kmp-default": "4.4.4_32_k3.12.61_52.133-22.68.1",
            "xen-libs-32bit": "4.4.4_32-22.68.1",
            "xen-tools-domU": "4.4.4_32-22.68.1",
            "xen": "4.4.4_32-22.68.1",
            "xen-doc-html": "4.4.4_32-22.68.1",
            "xen-tools": "4.4.4_32-22.68.1",
            "xen-libs": "4.4.4_32-22.68.1"
        }
    ]
}