kernal tried to execute MX-protected page - exploit attempt?

Ubuntu has crashed twice today. It reverts to text, the last line in the list of information reads, 'drm_kms_helper: panic occurred, switching back to text console. The Title of the post is the first line of text.

Any ideas what the problem is or suggestions about how to handle it? Images of text console, one from each of the crashes. Sorry about the rotation, not sure why that happened. crash2.jpgcrash.jpg