We previously enabled a workaround that breaks secureboot, as using mkimage to build the EFI grub images results in an unsigned image. We should only do this on 7.4, as the mac address issue is fixed in 7.5 and later.
Related issues
Bug #24653: Grub workaround for RHEL 7.4 should be only for 7.4
Added by Stephen Benjamin over 5 years ago
fixes #24653 - only use grub mkimage on RHEL 7.4
We previously enabled a workaround that breaks secureboot, as using
mkimage to build the EFI grub images results in an unsigned image. We
should only do this on 7.4, as the mac address issue is fixed in 7.5 and
later.