I will assume that you are currently using the HyperScale Appliance (Fujitsu Servers), if that is the case, this is an end-to-end solution provided by CommVault.
For OS Patching (kernel update on Redhat), I would recommend to engage CommVault Support to assist and find the correct pathway to upgrading. (Note - as the gluster services run on top of the OS, it is crucial to validate the environment by CommVault before proceeding).
I would also recommend to engage CommVault to validate CommServe VM Patching, just to validate any known issue between Microsoft and CommVault before proceeding.
Hopefully that helps