Sorry, i skipped the initial part of your post about tmp, was just focusing on the actual error, which is generated from mysql, not vbulletin.
Edit my.cnf or my.ini and set a new tmp path.
tmpdir = /home/tmp or the largest partition you have.
chown that new directory to mysql
restart mysql
Also, verify that your mysql init script is not forcing a tmp dir when starting sql.
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