Traffic officers have closed one lane on the northbound carriageway, between junctions 40 (Penrith) and 41 (Wigton), due to a vehicle fire.
Fire crews are at the scene and Highways England is warning of possible delays until 8.15am.
No injuries have been reported at this stage.
The incident is likely to cause some delays for those heading to Keswick, Ullswater and other popular spots in the North Lakes.
Support us and become a subscriber today. Enjoy unlimited access to local news, the latest football stories and new puzzles every day.
With a digital subscription, you can see fewer ads, enjoy faster load times, and get access to exclusive newsletters and content. Click here to subscribe.