This library is not included in NetBSD as far as I can tell: http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/modules/lua/?onl...
But it's an indication that it shouldn't be included in a Kernel.
I'm sure there are sooo many people running Linux on pre-OSX Mac harddrives formatted with HFS that could be hacked with a buffer overflow.
Are you seriously arguing that buffer overflows in the kernel are not a big deal?