Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in privilege escalation. In addition this updates provides mitigations for the Retbleed speculative execution attack and the MMIO stale data vulnerabilities. For additional information please refer to the following pages: https://xenbits.xen.org/xsa/advisory-404.html https://xenbits.xen.org/xsa/advisory-407.html