Tim:
Supposedly, it could show an ordinary user something they shouldn't know, hence the increased security, now.
Barry:
As I understand the risk it is the presences of addresses in dmesg output of kernel internals that are required for attacking the kernel.
I couldn't remember what it was.
And I suppose I should have said, more so than showing privileged info to ordinary *users*, that it could be handing such data to any malicious or compromised programs.