Error: The certificate /usr/share/rhn/ULN-CA-CERT is expired in Linux

While running yum utility if we are getting error with certificate expired for the repository. Then we can download the new correct certificate.

Error Message:
The certificate /usr/share/rhn/ULN-CA-CERT is expired. Please ensure you have the correct certificate and your system time is correct.

To update the client SSL certificate on your Oracle Linux machine, run the following steps.

        # cp /usr/share/rhn/ULN-CA-CERT /usr/share/rhn/ULN-CA-CERT.old
        # wget https://linux-update.oracle.com/rpms/ULN-CA-CERT.sha2
        # cp ULN-CA-CERT.sha2 /usr/share/rhn/ULN-CA-CERT