Linux kernel 2.6.18, and possibly other versions, when running on AMD64 architectures, allows local users to cause a denial of service (crash) via certain ptrace calls.
https://www.redhat.com/archives/fedora-package-announce/2008-May/msg00357.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9563
https://exchange.xforce.ibmcloud.com/vulnerabilities/42278
https://bugzilla.redhat.com/show_bug.cgi?id=431430
http://www.ubuntu.com/usn/usn-625-1
http://www.securitytracker.com/id?1020047
http://www.securityfocus.com/bid/29086
http://www.redhat.com/support/errata/RHSA-2008-0585.html
http://www.redhat.com/support/errata/RHSA-2008-0275.html
http://www.redhat.com/support/errata/RHSA-2008-0237.html
http://www.mandriva.com/security/advisories?name=MDVSA-2008:174
http://www.mandriva.com/security/advisories?name=MDVSA-2008:167
http://www.debian.org/security/2008/dsa-1588
http://secunia.com/advisories/31628
http://secunia.com/advisories/31107
http://secunia.com/advisories/30982
http://secunia.com/advisories/30962
http://secunia.com/advisories/30890
http://secunia.com/advisories/30818
http://secunia.com/advisories/30368
http://secunia.com/advisories/30294
http://secunia.com/advisories/30252
http://secunia.com/advisories/30112
http://lists.opensuse.org/opensuse-security-announce/2008-07/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2008-07/msg00007.html
http://lists.opensuse.org/opensuse-security-announce/2008-07/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2008-07/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2008-06/msg00006.html