Red Hat's Latest Project: "Bolt" To Deal With Linux Thunderbolt Security
Bolt Will Tackle Thunderbolt 3 Security on Linux

It looks like the GNOME bits could be ready for GNOME 3.28 and then we'll see in the future if KDE decides to make use of Bolt's D-Bus daemon for then building their own Plasma integration.

See also some more thoughts about this in this forum discussion.