WASHINGTON — Deeply personal information submitted by U.S. intelligence and military personnel for security clearances — mental illnesses, drug and alcohol use, past arrests, bankruptcies and more — is in the hands of hackers linked to China, officials said.

In describing a cyberbreach of federal records dramatically worse than first acknowledged, authorities point to Standard Form 86, which applicants are required to complete. Applicants also must list contacts and relatives, potentially exposing any foreign relatives of U.S. intelligence employees to coercion. Both the applicant’s Social Security number and that of his or her cohabitant are required.

In a statement, the White House said that on June 8, investigators concluded there was “a high degree of confidence that … systems containing information related to the background investigations of current, former and prospective federal government employees, and those for whom a federal background investigation was conducted, may have been exfiltrated.”

“This tells the Chinese the identities of almost everybody who has got a United States security clearance,” said Joel Brenner, a former top U.S. counterintelligence official. “That makes it very hard for any of those people to function as an intelligence officer. The database also tells the Chinese an enormous amount of information about almost everyone with a security clearance. That’s a gold mine. It helps you approach and recruit spies.”

The Office of Personnel Management, which was the target of the hack, did not respond to requests for comment. OPM spokesman Samuel Schumach and Jackie Koszczuk, the director of communications, have consistently said there was no evidence that security clearance information had been compromised.