If the mac address of eth0 is the cause of your problem, then a (non-ideal) workaround would be to use the stock NATed virbr0 for your VMs instead, as it won't be bridged with eth0.
If the mac address of eth0 is the cause of your problem, then a (non-ideal) workaround would be to use the stock NATed virbr0 for your VMs instead, as it won't be bridged with eth0.