The following is a list of published Top Secret for z/OS r16 fixes for AES 256 password encryption:
SO05264: AES ENCRYPTED PASSWORD CACHING OPTION
SO03648: LIST(PROFILE) DATA(PASS) MISSING PASS = *NONE*
SO01198: NEWER RADIUS MFA FACTORS NOT AES ENCRYPTED ON FILE
SI00733: PEA: AES256 CPU INCREASE DURING RACROUTE VERIFY PSWD IN CICS
RO99645: INCREASED CPU USAGE FOR AES256 VERIFY PASSWORDS IN CICS
RO98365: TSS REPL() PAS(*) MAKES AES128 PSWD UNUSABLE ON AES256 FILE
RO97411: NOPW LOST ON TSSXTEND CONVERT FROM AES128 TO AES256
RO91603: CICS S378 ABENDS WITH AES ENCRYPTION AT RSU 1412 AND ABOVE
RO90186: SIGNON PSWD CHANGES MAY FAIL ON REMOTE LPAR RUNNING AES256
RO89889: CICS SECREC BEING FREED DURING R_PASSWORD
RO87881: ERRONEOUS INITACEE 8/8:4 WITH ENVR_IN PARAMETER
RO87827: OVERLAY CICS SIGN ON WITH AES128/256
RO86945: AES 256 PASSWORD ENCRYPTION UPDATE