Security mailing lists that deal with Debian Linux security issues, specifically the debian-security-announce and debian-security lists. http://www.debian.org/MailingLists/subscribe
Searchable real-time updated archive of major security lists and newsgroups, including Cert, Securiteam, Linuxsecurity, VulnWatch, Full-Disclosure, Bugtraq, Incidents, Securityfocus, and several Usenet groups. http://www.derkeiler.com