Can one get permanent disability for spinal stenosis?

Yes: One can have such a degree of spinal stenosis such that they would be disabled. There may be surgical correction to rid one of the disability. I would hope you are looking at the positive side of this and to remain not disabled.

Possible : This depends on how physically impaired in terms of physical findings more with cervical levels leading to a myleopathy(dexterity/balance/spasticity) or radicular symptoms or findings of weakness/numbness or restricted by pain. This may also be true for the lower back but you most likely would be ok with a sitting occupation if dealing with lumbar stenosis requiring little standing/walking.