The unw_unwind_to_user function in unwind.c on Itanium (ia64) architectures in Linux kernel 2.6 allows local users to cause a denial of service (system crash).
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9040
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=148868
http://www.securityfocus.com/bid/13266
http://www.redhat.com/support/errata/RHSA-2005-366.html
http://www.redhat.com/support/errata/RHSA-2005-293.html
http://www.redhat.com/support/errata/RHSA-2005-284.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://secunia.com/advisories/20338
http://secunia.com/advisories/20202
http://secunia.com/advisories/20163
http://secunia.com/advisories/15019
http://linux.bkbits.net:8080/linux-2.6/cset%4041f2beablXVnAs_6fznhhITh1j5hZg