VM Isolation

I have been running UBUNTU bare metal on my servers for a long time. Most recently I installed it on an older laptop to see how it works with my daily desktop usage. So far so good. Now I want to put it onto a new system only to find the system is tied to Windows 10. I do not want Windows 10 running my work for a variety of reasons. I attempted to install Linux (UBUBTU) on my new laptop only to find even when I swapped HDD I couldn't. That's another story.

My question here is: If I install Oracle VM Box on my Windows 10 machine, Install UBUNTU as a VM Guest, what access does Windows 10 have to the information on the UBUNTU VM?

Any insight will be greatly appreciated.

Mike