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
Created xen tracking bugs for this issue:
Affects: fedora-all [bug 2034941]
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.