How to check kernel version installed in the system

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Issue

How come I have RHEL 5.6 installed on the system

[root@station ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.6 (Tikanga)

[root@station ~]# uname -a
Linux station 2.6.18-92.1.22.el5 #1 SMP Fri Dec 5 09:28:22 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

Environment

Red Hat Enterprise Linux 5 and later

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