www.ksplice.com provides a means of applying patches to a Linux Kernel without having to reboot. Once those patches are applied the built-in uname command shows the booted kernel but not the effective kernel. ksplice provides uptrack-name with all the same command line switches that will give the effective kernel. If the uptrack-uname command is available, the System information page should use it for Kernel and CPU.
eg:
uname -a
Linux myserver.mydomain.com 2.6.32-71.29.1.el6.i686 #1 SMP Mon Jun 27 18:07:00 BST 2011 i686 i686 i386 GNU/Linux
uptrack-uname -a
Linux myserver.mydomain.com 2.6.32-131.12.1.el6.i686 #1 SMP Sun Jul 31 16:44:30 EDT 2011 i686 i686 i386 GNU/Linux
Good idea .. I will do this in the next Webmin release.