gentoo-sources-2.6.30-r3 contains a fix for a security flaw that also comes complete with some exploit code.
Apparently, it only affects 2.6.30 so if you gentoo-sources-2.6.30 please upgrade to r3.
I just committed it, so it should hit the mirrors soon after I post this.
Thanks to everyone who brought to my attention and thanks kerframil for the links below that provide additional information.
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