Sum 41 has cancelled all touring for the remainder of the year. The band explained:

As many of you have already heard, Deryck has suffered a herniated disk in his back and we were forced to cancel all shows scheduled for this year. We’re sorry that this has happened and we hope our fans understand that there was nothing we could have done to prevent this. We wish Deryck and quick and full recovery and can’t wait to reschedule all these shows in the new year and finally get back out on the road.

The band released Underclass Hero earlier this year.
Source Sum 41 has cancelled all touring for the remainder of the year. The band explained:

As many of you have already heard, Deryck has suffered a herniated disk in his back and we were forced to cancel all shows scheduled for this year. We’re sorry that this has happened and we hope our fans understand that there was nothing we could have done to prevent this. We wish Deryck and quick and full recovery and can’t wait to reschedule all these shows in the new year and finally get back out on the road.

The band released Underclass Hero earlier this year.
Source