The do_devinfo_ioctl function in drivers/staging/comedi/comedi_fops.c in the Linux kernel before 3.1 allows local users to obtain sensitive information from kernel memory via a copy of a short string.
https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.1.bz2
https://github.com/torvalds/linux/commit/819cbb120eaec7e014e5abd029260db1ca8c5735