Applying Oracle Critical Patch - CPU

Follow these steps:

Assume that we are in a single instance (Not RAC), shut down all instances and listeners associated with the Oracle home that you
are updating.

Ensure that the $PATH has the following executables: make, ar, ld, and nm.
The location of these executables depends on your operating system. On many operating systems, they are
located in /usr/ccs/bin, in which case you can set your PATH as follows:

export PATH=$PATH:/usr/ccs/bin
or
export PATH=$PATH:$ORACLE_HOME/OPatch


Set your current directory to the directory where the patch is located and then run the OPatch utility by entering
the following commands:
unzip p14390377_112020_.zip
cd 14390377

Then run

opatch napply -skip_subset -skip_duplicate

After installing succefully check

opatch lsinventory

You can see the latest patch versions updated

connect to the database using SQL*Plus. Connect as SYSDBA and run the catbundle.sql script as follows:
cd $ORACLE_HOME/rdbms/admin
sqlplus /nolog
SQL> CONNECT / AS SYSDBA
SQL> STARTUP
SQL> @catbundle.sql cpu apply
SQL> QUIT

If catbundle is not recognizing run it with the path

SQL > @?/rdbms/admin/catbundle.sql cpu apply

Finally check the below path for any errors

catbundle_CPU__APPLY_.log
catbundle_CPU__GENERATE_.log

References
https://updates.oracle.com/Orion/Services/download?type=readme&aru=15433726#CHDCBBFE