A multitude of websites relate to security. One in particular hosts an excellent mailing list. The site is called Security Focus, and the mailing list is called BugTraq. BugTraq is well-known for its unbiased discussion of security flaws. Be warned: It receives a relatively large amount of traffic (20100+ messages daily).
Often security holes are discussed on BugTraq before the software makers have even released the fix. The Security Focus site has other mailing lists and sections dedicated to Linux in general and is an excellent resource.
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