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Regarding the "unspecified Linux vulnerability" that the author has been "hyping the shit out of" (their words) all week -

It's accidentally leaked, due to an unpaid open source maintainer making a boo boo.

It's in CUPS, a printing subsystem. It isn't Linux specific.

CUPS isn't faced much to the internet, I've checked and done a Shodan Safari. It also isn't installed by default on Linux server installs for almost all distros.

It's not a big deal, update packages are dropping, don't panic.