Updating to MacOS 14.2 also meant I had to update to the latest VirtualBox version, apparently. I couldn’t start any of my VMs, was getting a “VBoxManage: error: The virtual machine … has terminated unexpectedly during startup because of signal 9” error. I had version 7.0.4 but had to update to the latest (7.0.12). Not sure what the issue was, but upgrading fixed it.