The next FREL release will include OS patches for spectre and meltdown. (This may not necessarily mean SP11, as it might be in the form of an updated OVA for the current service pack FREL's. Though the ETA is not confirmed yet, and being actively worked on.) -
As an immediate solution, the SP10 FREL has the added functionality where the user can choose to have it automatically check for and apply OS security updates. This would include the OS security updates for spectre and meltdown.
For SP9, please manually patch the OS as the SP9 FREL does not have the automatic checking feature.
Technical Account Manager - Commvault