If there are 0day exploits for Fedora or Fedora backdoors that are not discovered then would this make dom0 less secure or would it not matter?
Short answer: yes, dom0 is based on Fedora, and generally speaking Fedora vulnerabilities affect dom0. (That’s why you don’t run software in dom0 if you can avoid it.)
Whether they are exploitable is a different question, since dom0 is permanently kept offline and data flows incoming dom0 are generally limited.
Relevant:
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