Hossain, 24, was reported during the first Test against the West Indies in St Vincent in September, but tests conducted in India revealed his deliveries were legal as per ICC regulations.
"During a comprehensive analysis it was revealed that the amount of elbow extension in Al-Amin's bowling action for all deliveries was within the 15-degree level of tolerance permitted under the ICC regulations," a statement from the world governing body said.
The analysis was performed at the ICC's newly accredited testing centre at the Sri Ramachandra University in Chennai on October 20, the statement added.
Hossain, who has played six Tests and 18 limited-overs internationals, opted out of the ongoing second Test against Zimbabwe in Khulna to write his university exams.
The ICC recently launched a drive against suspect actions, leading to the suspension of leading bowlers like Saeed Ajmal of Pakistan and Sachithra Senanayake of Sri Lanka.
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