SO12236 is identified in the compatibility matrix as being required for z/OS 2.4 compatibility but doesn't appear to be 'tagged' with the FIXCAT CA.TargetSystem-RequiredService.z/OS.V2R4.
Is this actually required for z/OS 2.4 or is it just to support TLS v1.3?
Common Services 15.0 - z/OS supported releases -
SO12236 is listed in the Fix Category for z/OS 2.4:
CA Common Services for z/OS 15.0
Fix Category: CA.TargetSystem-RequiredService.z/OS.V2R4
Event Notification Facility (CAW1F00)
Looking at SO12236, it resolves 4 problems:
The following items are included in this solution:
1. TLSV1.3 SUPPORT
2. CCIPC: OPENSSL 1.1.1B; SUPPORT SEARCH_GROUPS/GENERIC IN INQY
3. CCI FAILS WHEN IBM'S TLS SUPPORT NOT INSTALLED
4. 0C4 IN CCITCPGW IF CLOSING PARENTHESES IS IN THE PARM FIELD
So, the response is:
SO12236 is required for z/OS 2.4 and to support TLS v1.3.