Hendricks & Lewis said they helped Love get more than $7 million in advances on Cobain and Nirvana material, but she still owes the firm more than $340,000, MTV.com reported Wednesday.
The suit, which also names Love's daughter, Frances Bean Cobain, seeks a lien on all of Love's papers in their possession including works by Cobain, MTV said.
Love's manager, Peter Asher, told MTV: "The matter is in Courtney's lawyer's hands."
The rocker and actress is currently undergoing court-ordered drug rehab.
Handler slams Piers Morgan: 'You're a terrible interviewer'
LGBT community has 'bullied the American people': Bachmann