More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2298687 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The patch for this has been applied in xen-4.18.2-4.fc41, xen-4.18.2-4.fc40 and xen-4.17.4-2.fc39