4.18-rhel8.series 4.18.0-80.11.2.el8 (RHEL 8.0)
4.18-rhel8.1.series 4.18.0-147.8.1.el8 (RHEL 8.1)
4.18-rhel8.2.series 4.18.0-193.19.1.el8 (RHEL 8.2)
+4.18-rhel8.3.series 4.18.0-240.1.1.el8 (RHEL 8.3)
See lustre/ChangeLog for supported client kernel versions.