The 25-year-old will provide injury cover for the Exiles' David Paice, who is out with a fractured radius.
The former Stirling County youth now plays his club rugby for Heriots but has yet to break into Glasgow's first team after penning a one-year deal earlier this year.
Warriors head coach Gregor Townsend said: "This is a great opportunity for Kevin to go down and get some playing experience in the Aviva Premiership.
"He's a model pro and is working extremely hard to develop his game.
"Despite featuring regularly for Heriot's, he hasn't broken into our starting team yet - so the move to London Irish will help him get closer to our matchday squad.
"We wish him all the best down in London and we look forward to welcoming him back to the club in the new year."
London Irish director of rugby Brian Smith added: "Kevin is a very promising young hooker. He's providing cover for David Paice who is still a month away from playing.
"Gregor Townsend has kindly loaned Kevin to us, he's a tough lad with a good all-round game. I'm sure he'll do well while he is with us."
- Sports & Recreation
- David Paice
- Gregor Townsend
- London Irish