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sharing my simple wireguard kill-switch for Linux
(lemmings.world)
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Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Oh. It doesn't work with WireGuard then. It probably works with garbage. Thank you.
I am afraid you are still a bit misled; WireGuard is exactly what they use for the demo video. In general the underlying protocol does not matter, since the vulnerability is about telling the system to direct the packages to the attacker, completely bypassing the VPN.
That "vulnerability" seems more like a case of "people who use hostile networks have not considered which features that work as designed should be disabled in their use case".
Using untrusted networks is quite common, like coffee shop wifi or airport wifi.