Here's the latest on the Cowboys and Maxx Crosby trade rumors based on the wiki:
The Cowboys have been active pursuers. Per the wiki, Dallas made multiple offers for Crosby this offseason and may continue to pursue him. ESPN insider Dan Graziano specifically named the Cowboys — alongside the Patriots, Bills, and Bears — as a "potential fit" for Crosby ahead of the trade deadline. (from the Maxx Crosby page)
But the big catch is his health. Crosby's trade market cratered after a failed physical scuttled a deal with the Ravens back in February. CBS Sports notes that once he returns to the field in August and proves full recovery from his meniscus repair, league interest could "spike again" — and that's when Dallas could re-engage. Graziano also cautioned that Crosby "might stick with the Raiders all year at this point" depending on his health. (from the Maxx Crosby page)
Other teams are circling too. The Patriots and 49ers have emerged as leading suitors, and the Eagles were reported as "nuclear hot" by a Raiders insider (though analysts see an Eagles deal as unlikely given their edge-rush room depth). So the Cowboys aren't alone in the chase. (from the Maxx Crosby page)
Bottom line: Dallas wants him and has made offers, but nothing is close right now. Everything hinges on Crosby proving he's 100% healthy during training camp in August. If he does, the trade deadline could get very interesting for Cowboys fans.