arch/s390/kernel/ptrace.c in Linux kernel 2.6.9, and other versions before 2.6.27-rc6, on s390 platforms allows local users to cause a denial of service (kernel panic) via the user-area-padding test from the ptrace testsuite in 31-bit mode, which triggers an invalid dereference.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9555
https://exchange.xforce.ibmcloud.com/vulnerabilities/41501
http://www.debian.org/security/2008/dsa-1655
http://www.debian.org/security/2008/dsa-1653
http://secunia.com/advisories/32799
http://secunia.com/advisories/32356
http://secunia.com/advisories/32315
http://secunia.com/advisories/32237
http://secunia.com/advisories/31826
http://rhn.redhat.com/errata/RHSA-2008-0972.html
http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00007.html
http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.27-rc6