@semarie Thank you for the heads up.
@rvreugde I should add an important caveat. Because this is a Local Privilege Escalation (LPE) vulnerability, it requires local access to execute. If you haven't provisioned any unprivileged accounts in Dom0, your exposure is minimal, as an attacker would already need an existing foothold in the host OS to leverage these exploits.
As a side note, I just checked the active XCP-ng repositories for Dom0, and I don't see any official updates or patches pushed out for either vulnerability just yet.