The ntty_ioctl_tiocgicount function in drivers/char/nozomi.c in the Linux kernel 2.6.36.1 and earlier does not properly initialize a certain structure member, which allows local users to obtain potentially sensitive information from kernel stack memory via a TIOCGICOUNT ioctl call.
https://bugzilla.redhat.com/show_bug.cgi?id=648663
http://secunia.com/advisories/42890
http://securityreason.com/securityalert/8129
http://www.openwall.com/lists/oss-security/2010/09/25/2
http://www.openwall.com/lists/oss-security/2010/10/06/6
http://www.openwall.com/lists/oss-security/2010/10/07/1
http://www.openwall.com/lists/oss-security/2010/10/25/3