Jason Witten's first touchdown as a Raider also marked a major milestone for Derek Carr.
The quarterback matched Raiders Hall of Famer Ken Stabler for the most passing touchdowns in franchise history with his 150th in the NFL.
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Carr would later take over the all-time Raiders record with a fourth-quarter touchdown pass to Nelson Agholor.
Stabler reached the mark in 10 seasons with the Silver and Black, while it took Carr just seven to do the same.
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Witten joined the Raiders in free agency after 16 seasons with the Dallas Cowboys, and is a solid veteran backup for Carr's favorite target in Darren Waller.
Las Vegas went on to lose 30-23 to Buffalo to fall to 2-2 this season.