The coda_pioctl function in the coda functionality (pioctl.c) for Linux kernel 2.6.9 and 2.4.x before 2.4.29 may allow local users to cause a denial of service (crash) or execute arbitrary code via negative vi.in_size or vi.out_size values, which may trigger a buffer overflow.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11690
http://www.vupen.com/english/advisories/2005/1878
http://www.securityfocus.com/bid/14967
http://www.securityfocus.com/archive/1/428028/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2006-0191.html
http://www.redhat.com/support/errata/RHSA-2005-663.html
http://www.debian.org/security/2006/dsa-1082
http://www.debian.org/security/2006/dsa-1070
http://www.debian.org/security/2006/dsa-1069
http://www.debian.org/security/2006/dsa-1067
http://www.debian.org/security/2006/dsa-1017
http://securitytracker.com/id?1013018
http://secunia.com/advisories/20338
http://secunia.com/advisories/20202
http://secunia.com/advisories/20163
http://secunia.com/advisories/19374
http://secunia.com/advisories/18684
http://secunia.com/advisories/17002
http://seclists.org/lists/linux-kernel/2005/Jan/2020.html
http://seclists.org/lists/linux-kernel/2005/Jan/2018.html