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Based on Timatic (the visa system most airlines use), Iraqi citizens do not require a visa when transiting UAE airports as long as they are departing from the same airport within 24 hours of arrival. You will NOT be allowed to go landside, however especially at Dubai there is no need to.
Note that as for many countries, UAE does not allow entry or transit to holders of Iraqi "S" series passports (ie, non-machine readable passports)