CVE-2021-28713

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. Three affected backends: blkfront patch 1, CVE-2021-28711, netfront patch 2, CVE-2021-28712, hvc_xen (console) patch 3, CVE-2021-2871