Controlfiles saved at least in 2 locations. If one of them is corrupted then you can copy from other one after shutdown database. In this case I will show you how to recover from autobackup via RMAN. So you need CONFIGURE CONTROLFILE AUTOBACKUP ON; in RMAN and you should have full backup database. It can recover even if all controlfiles are unavailable.

Two controfiles are there.

Note: Database should be open with RESETLOGS options after recovering controlfiles.

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