This bug has been copied from bug #1568676 and has been proposed to be backported to 7.5 z-stream (EUS).
Verified with package：
1. Prepare a rhel7.5.z： RHEL-7.5-updates-20180417.2 ,and set this repo:
2. Install libguestfs
# yum install libguestfs
Libguestfs can be installed successfully without dependency error.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.