The ftdi_sio driver (usb/serial/ftdi_sio.c) in Linux kernel 2.6.x up to 2.6.17, and possibly later versions, allows local users to cause a denial of service (memory consumption) by writing more data to the serial port than the hardware can handle, which causes the data to be queued.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10265
https://exchange.xforce.ibmcloud.com/vulnerabilities/27807
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=197610
http://www.vupen.com/english/advisories/2006/2841
http://www.ubuntu.com/usn/usn-346-1
http://www.ubuntu.com/usn/usn-331-1
http://www.securityfocus.com/bid/19033
http://www.securityfocus.com/archive/1/440300/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2006-0617.html
http://www.novell.com/linux/security/advisories/2007_35_kernel.html
http://www.novell.com/linux/security/advisories/2007_30_kernel.html
http://www.novell.com/linux/security/advisories/2007_21_kernel.html
http://www.novell.com/linux/security/advisories/2007_18_kernel.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:151
http://www.mandriva.com/security/advisories?name=MDKSA-2006:150
http://www.debian.org/security/2006/dsa-1184
http://support.avaya.com/elmodocs2/security/ASA-2006-203.htm
http://secunia.com/advisories/25683
http://secunia.com/advisories/25226
http://secunia.com/advisories/24547
http://secunia.com/advisories/22174
http://secunia.com/advisories/22093
http://secunia.com/advisories/21934
http://secunia.com/advisories/21614
http://secunia.com/advisories/21605
http://secunia.com/advisories/21298