@p @dj @ryan @phnt @ins0mniak @lanodan >That's what the other three firewalls are for. You'd need four backdoors!
Yes, the attacker just exploits each of the 4 backdoors in sequence.

>No protection against IME backdoors.
I forgot to mention installing GNUboot and once that done there is no IME backdoor, as such proprietary software is not included in the images (on GNUbootable intel computers that came with an IME, the IME is an extra processor added to the NIC and can be disabled by simply not loading anything onto it).

You'd really want to use an KGPE-D16 GNUbooted systemd, as the Opteron 62XX processors appear to not even come with a backdoor processor.