The presidential adviser, who is married to Ivanka Trump, had his access to America’s most closely guarded secrets restricted but the decision has now been reversed, according to the AFP news agency, which cited a source who was briefed on the issue.
The decision to restrict the 37-year-old aide’s access had cast serious doubt over his status within the White House and his ability to negotiate in the Middle East.
Mr Kushner’s lawyer, Abbe Lowell, confirmed Mr Trump’s adviser had now completed the security clearance process.
He said: “His application was properly submitted, reviewed by career officials, and went through the normal process.
“Having completed these processes, Mr Kushner is looking forward to continuing the work the president has asked him to do.”
White House chief of staff John Kelly had ordered the February changes to the clearance process after another aide – Rob Porter – was the subject of allegations he abused both of his ex-wives.
Mr Kushner’s application had been stalled by several revisions and because of previously undisclosed contacts with foreign individuals.
In his statement, Mr Lowell added that Mr Trump’s son-in-law had also sat for a second time with special counsel Robert Mueller, who is investigating the US leader’s campaign links with Russia over alleged election meddling.
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“He has continued this complete cooperation, providing a large number of documents and sitting for hours of interviews with congressional committees and providing numerous documents and sitting for two interviews with the office of special counsel,” Lowell said.
“In each occasion, he answered all questions asked and did whatever he could to expedite the conclusion of all the investigations.”