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This kernel doesn't handle early microcode load properly (it tries to load
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microcode even in virtualised environment, which may lead to a panic on some
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hypervisors), thus the microcode files have not been added to the initramfs
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image.  Please update your kernel to one of the following:
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  RHEL 7.5: kernel-3.10.0-862.14.1 or newer;
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  RHEL 7.4: kernel-3.10.0-693.38.1 or newer;
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  RHEL 7.3: kernel-3.10.0-514.57.1 or newer;
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  RHEL 7.2: kernel-3.10.0-327.73.1 or newer.
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Please refer to /usr/share/doc/microcode_ctl/caveats/intel_readme
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and /usr/share/doc/microcode_ctl/README.caveats for details.