You probably never heard of this distro. It is used by the United States government for scientific programs. This Linux is called Fermi Linux and it's current kernel is 2.6.18-238.1.1.el5. Normally, in OpenSuse 11.3, the kernel gets to revision 12 (184.108.40.206) or in Ubuntu 10.10, the kernel gets to revision 25 (2.6.35-25). The distro is based off Red Hat Enterprise 5.0.
P.S. Fermi might have something to do with nuclear weapons or nuclear physics or particle physics. It is supposed to be used at Tevatron to get data on Higgs mechanism which takes place in nature.