According to Rick Hasen at electionlawblog.org:

“The unanimous panel decision not only found that the state likely violated Section 2 in failing to create a second black majority congressional district. It also rejected the state’s argument that private plaintiffs have no right to sue under Section 2, an issue that has been percolating in the lower courts after a couple of Supreme Court Justices raised it.”

Here is the Fifth Circuit’s decision.