Erik Menendez doesn’t sound like he’s getting the prison furlough he was hoping for … because he’s back behind bars after painful kidney stones sent him to the hospital.

Erik’s daughter, Talia, shared an update on social media … saying, “My dad is out of the hospital and back at the prison, preparing for our upcoming parole hearing.”

We broke the story … Erik left his state prison in San Diego last month and went to a hospital to undergo several surgeries to remove kidney stones.

Erik was out of prison and in the hospital for about a week … and his lawyer, Mark Geragos, said it was a “serious medical condition.”

As we first told you … our sources said California Governor Gavin Newsom was reviewing Erik’s change in medical condition to determine if a “prison furlough” was appropriate.

With Erik and Lyle’s upcoming parole hearing only a few weeks away on August 22 … the thinking was, Newsom might cut Erik a major break and grant him a furlough so he didn’t have to go back to prison before the hearing.

Sounds like that didn’t happen … and Erik’s got at least a few more weeks behind bars with Lyle. The hearing is fast approaching and Newsom has indicated he’s sympathetic to granting both Erik and Lyle clemency.