The strnlen_user function in Linux kernel before 2.6.16 on IBM S/390 can return an incorrect value, which allows local users to cause a denial of service via unknown vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9909
http://www.vupen.com/english/advisories/2006/2554
http://www.securityfocus.com/bid/18687
http://www.redhat.com/support/errata/RHSA-2006-0575.html
http://www.mail-archive.com/kernel-svn-changes%40lists.alioth.debian.org/msg01631.html
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.16-rc6
http://www.debian.org/security/2006/dsa-1103
http://support.avaya.com/elmodocs2/security/ASA-2006-200.htm
http://secunia.com/advisories/22417