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.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.