Blame SOURCES/06-5e-03_disclaimer

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Microcode revisions 0xda and higher for Intel Skylake-H/S/Xeon E3 v5 (family 6,
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model 94, stepping 3; CPUID 0x506e3) are disabled as they may cause system
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instability; the previously published revision 0xd6 is used instead.
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Please refer to /usr/share/doc/microcode_ctl/caveats/06-5e-03_readme
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and /usr/share/doc/microcode_ctl/README.caveats for details.