Rogue backends can cause DoS of guests via high frequency events This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE. Xen offers the ability to run PV backends in regular unprivileged guests typically referred to as \driver domains\. Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised it doesn't have the privileges to take over the system. However a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1 CVE-2021-28711 * netfront patch 2 CVE-2021-28712 * hvc_xen (console) patch 3 CVE-2021-28713