Kernel versions on different RHELs...

note to self When ever you need to find out a kernel version of a particular RHEL version or an update, you can head over to this Knowledge Base Article. Hope they are keeping it up-to-date. Below is what it contains right now.

Red Hat Enterprise Linux
Update	v. 2.1	v. 3	v. 4	v. 5
GA	2.4.9-e.3	2.4.21-4	2.6.9-5	2.6.18-8
U1	2.4.9-e.12	2.4.21-9	2.6.9-11	2.6.18-53
U2	2.4.9-e.24	2.4.21-15	2.6.9-22	2.6.18-92
U3	2.4.9-e.34	2.4.21-20	2.6.9-34	-
U4	2.4.9-e.40	2.4.21-27	2.6.9-42	-
U5	2.4.9-e.49	2.4.21-32	2.6.9-55	-
U6	2.4.9-e.57	2.4.21-37	2.6.9-67	-
U7	-	2.4.21-40	2.6.9-78	-
U8	-	2.4.21-47	-	-
U9	-	2.4.21-50	-	-