Interesting
/etc/motd is filled with the version of your kernel by /etc/rc.d/rc.S:
Code:
# Update the current kernel level in the /etc/motd (Message Of The Day) file,
# if the first line of that file begins with the word 'Linux'.
# You are free to modify the rest of the file as you see fit.
if [ -x /bin/sed ]; then
/bin/sed -i "{1s/^Linux.*/$(/bin/uname -sr)\./}" /etc/motd
fi
Check what your machine says when you type uname -sr on the command line.
If it returns the kernel version normally (something like 2.6.32.7 for -current), edit /etc/motd manually to read "Linux xxx" and it should be updated again at your next boot.