The chase_port function in drivers/usb/serial/io_ti.c in the Linux kernel before 3.7.4 allows local users to cause a denial of service (NULL pointer dereference and system crash) via an attempted /dev/ttyUSB read or write operation on a disconnected Edgeport USB serial converter.
https://github.com/torvalds/linux/commit/1ee0a224bc9aad1de496c795f96bc6ba2c394811
https://bugzilla.redhat.com/show_bug.cgi?id=916191
http://www.ubuntu.com/usn/USN-1808-1
http://www.ubuntu.com/usn/USN-1805-1
http://www.openwall.com/lists/oss-security/2013/02/27/29
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.7.4
http://rhn.redhat.com/errata/RHSA-2013-0744.html
http://lists.opensuse.org/opensuse-security-announce/2013-09/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2013-05/msg00018.html