If you ever find ourself in need to determine what version of Linux kernel the system is running you can simply use the following command:
Alternatively you can check following files for the kernel info (availability and location depends on release):
Of course you can always see the version of the kernel RPM package installed by grep-ing the RPM query command for "kernel" (unless the kernel on your system was compiled from scratch):
rpm -qa | grep kernel
If you find any more clever ways of getting your kernel information, please post in the comments.