Others have already provided good criticism of the #cups #vulns, so i'll just add this:
unless it's in the kernel, systemd or openssh, I don't think you can claim a vuln will affect "all GNU/Linux systems". even stuff like coreutils, bash, etc aren't installed by default on a lot of the lightweight distros that get used for containers or k8s clusters these days.
CUPS in particular is ancient shit that isn't anywhere near our prod infra, and isn't even installed on desktop distros any more AFAIK.
The more nothingburger vuln disclosures we see making the rounds, the less seriously everyone will take #infosec, which makes all of our lives harder.