It seems that you have a prerequisite missing. There is a bug in FMW versions prior to 18.104.22.168 that causes this issue (in 12.2.4, FMW 22.214.171.124 is installed by default).
Please run this command and see if it returns any output:
rpm -q redhat-lsb
Yes, that rpm has been installed.
# rpm -q redhat-lsb
Check the workaround in the following document (126.96.36.199 on redhat linux 6):
Oracle Fusion Middleware Installer Fails Certification Check On Red Hat Enterprise Linux 6.x (Doc ID 1487381.1)