If it's a VM bug then why does it also happen on other OSes without running a VM? The same bit of software: * Crashes the OS when running native, where OS is

If it's a VM bug then why does it also happen on other OSes without running a VM? The same bit of software: * Crashes the OS when running native, where OS is Windows, Mac, and Linux. * Crashes the host OS from inside a VM running Linux or Windows. I can't think of any explanation other than a hardware bug. How can the same crash happening inside and outside a VM on multiple OSes be anything else?