Xen is being updated to mitigate some vulnerabilities:XSA-439: CVE-2023-20588. On AMD Zen1 CPUs, "an attacker might be able to infer data from a different execution context on the same CPU core." Test on XCP-ng 8.2
From an up to date host:yum clean metadata --enablerepo=xcp-ng-testing yum update "xen-*" --enablerepo=xcp-ng-testing reboot
Version:xen: 4.13.5-9.36.2.xcpng8.2 What to test
Normal use and anything else you want to test. The closer to your actual use of XCP-ng, the better.
Test window before official release of the updates