This could be very distro dependant. The __kernel__ itself should be able to be upgraded regardless, but if the distro itself has made any changes that haven't been mainlined, then it's no guarantee that it will work.
The best bet is to wait until Novell or SUSE releases it's next kernel. Theoretically, you could pick up the latest kernel and compile it, and everything should be fine, but in practice, this isn't the smartest thing to do.
If you absolutely __need__ a newer kernel, then the only choice is to go to kernel.org and upgrade it manually, but there's no guarantee that it will be compatible with your distro. It should be, but....
If you're not familiar with kernel compiling, then I'd wait until the next official distro release. Otherwise, you're stuck in experimentation land.