A U.S. court has handed down a preliminary decision to temporarily halt video game publisher
In the suit, Hayes contended the deal had not been put to Activision's shareholders for a majority vote.
Activision said in July that it would acquire 429 million shares from the Paris company for about $5.83 billion in cash, or $13.60 a share, as Vivendi is looking to shed assets.
Separately, Activision Chief Executive Bobby Kotick, Co-Chairman Brian Kelly and their investor group would buy about 172 million shares from Vivendi at a cost of $2.34 billion.
"Activision Blizzard remains committed to the transaction and is exploring the steps it will take to complete the transaction as expeditiously as possible," the company said in a statement.
The transaction is on hold "unless the injunction is modified on appeal or the transaction is approved by a stockholder vote of the non-Vivendi stockholders," the company said.