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What's a good security mailing list for the general GNU/Linux/etc ecosystem?
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Why don't you go to the official CVE channel instead at cve.org?
Otherwise, major distros usually have some sort of tracker, which is especially useful to see if a vulnerability in the upstream has been addressed. I know this exist for Gentoo, Debian, Ubuntu, and OpenSUSE. May need to check for other distros. If you're looking for correspondencies in this regard, they probably have their security mailing list.
I think most of them have switched to matrix/other more modern alternatives