Upgrade Linux kernel

Upgrade of the kernel in Debian or Ubuntu Linux

# apt-cache search kernel-image   ( find the kernel image)

#apt-get install kernel-image-x.x.x-xx

Upgrade of the kernel in Fedora Linux / CentOS / RHEL 5

#yum update kernel

You can also download the rpm and execute the below command

#rpm -ivh kernel*

Upgrade of the kernel in Red Hat enterprise Linux version <= 4.x

if your system is registered with RHN support then

#up2date -f kernel

For SMP kernel (for multiple CPU) use the below command:

#up2date -f kernel-smp