Please don't do this... having bots launch a DDoS attack on kernel.org is not good.

Just throw the request away or return a 404 at the load balancer level.

If you're on Apache use mod_security, if you're not put Varnish in front and configure it to return simple 404 errors on such pages.

But don't mod_rewrite, redirect or otherwise throw traffic onto someone else's server, let alone one that will result in a traffic cost for them.