The following command shows the current active kernel!

uname -r

There may be an installed kernel on the device that is NOT active. You should run the following command to check installed kernels, and then compare the installed kernel to the active kernel method shown above.

rpm -q kernel | tail -n 1

WARNING: Please note, the kernel may be excluded from yum updates in /etc/yum.conf. Another command useful for exploring the latest kernel and avoiding the excludes can be found below:

yum list updates kernel -q --disableexcludes=all 2>&1