[...] security vulnerability in the virtual floppy drive code [...] For many of the affected virtualization products, a virtual floppy drive is added to new virtual machines by default.

That is a pretty simple mitigation. Make sure there are no (unnecessary) virtual floppy devices defined in your VMs.

I checked my VMs (Ubuntu/KVM) and, as expected, none of them have a virtual floppy - they are not added by default on that platform.