Host Weakness Leading to VM Exploit

There are a ton of posts about VM leakage to the host. But what about the opposite?

Let's say the following exists:

1. You question the security / confidentiality of your host machine, whether due to use by other parties or otherwise
2. You absolutely trust and, for the purposes of this question, know, the virtualization software is bug/exploit free
3. You isolate the VM from the host, so no shared files/folders, bridged network, etc.
4. VM image is of …

confidentiality cybersecurity exploit host machine posts question security ton trust weakness