I have exactly same issue on some linux servers protected by ENSL.
I opened a ticket on McAfee support since 2 months, only workaround that McAfee gave me for the moment is to removed the /var/McAfee/ens/tp/engine/dat/ folder and re-run an update. It seems that ENSL cannot remove old Dat folder or need an unknown amount of space on /var.
I still looking for a fix instead of trying to reinstall ENSL ok remove folder manually..
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