Three times now, I have suddenly been unable to load my VMs in Fusion 11.5.6 because of the following message: "Could not open /dev/vmmon: Broken pipe. Please make sure that the kernel module `vmmon' is loaded". Only after reinstalling MacOS 10.14.6 have it started to work again. Today I finally figured out why, after it stopped woking again after installing Security Update 2020-005 and MacOS Supplemental Update. Does anyone have a solution for this? I'm getting tired of reinstalling MacOS.
I have previously posted in this thread: Re: Broken pipe problem in Mojave
And here are some additional info with another person having the same issue: https://mrmacintosh.com/10-14-6-supplemental-update-safari-14-released-to-fix-previous-issues/