It's doubtful that this is someone attacking your system, but we don't know for sure, even so, it's a common occurrence for automated attempts to happen daily.
Make sure you configure your system software properly, and use the built in firewall, pf.
Calling your local authorities was highly premature, and in the case of a successful remote exploitation, there is very little they can do if the attack is taking place from another country.
The potential exploit mentioned by shep is utilizing the shared memory functionality of Xorg to exploit the Linux kernel when X is running with elevated (root) privileges.
This new vulnerability, while partly an X bug, is currently only a concern when using the Linux kernel.. it will not have any effect on OpenBSD and this is also partly because of the security features enabled by default, an adaptation will not be easy.
It is also described as a local privilege escalation, not a remote attack vector.
@shep, it would be nice if in the future you would avoid scaring the heck out of new users.
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