ksplice was supported in rhel.. when oracle purchased it, they announced they were going to drop rhel, and then turned it into a 30-day free trial-- after the 30-days, you must switch to oracle linux to continue using ksplice.

Everyone we sold Ksplice to on RHEL is still running Ksplice on RHEL. So it's more accurate to say that we closed the door on new subscriptions for anything other than Oracle Linux, but all existing subscriptions remain unaffected (and those customers can even add new systems, if they'd like to.)