fs/direct-io.c in the dio subsystem in the Linux kernel before 2.6.23 does not properly zero out the dio struct, which allows local users to cause a denial of service (OOPS), as demonstrated by a certain fio test.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=848c4dd5153c7a0de55470ce99a8e13a63b4703f
lists.opensuse.org/opensuse-security-announce/2008-10/msg00000.html
lists.opensuse.org/opensuse-security-announce/2008-10/msg00007.html
lists.opensuse.org/opensuse-security-announce/2008-10/msg00008.html
lists.opensuse.org/opensuse-security-announce/2008-11/msg00001.html
lists.opensuse.org/opensuse-security-announce/2008-12/msg00000.html
lkml.org/lkml/2007/7/30/448
rhn.redhat.com/errata/RHSA-2008-0972.html
secunia.com/advisories/32023
secunia.com/advisories/32103
secunia.com/advisories/32237
secunia.com/advisories/32356
secunia.com/advisories/32370
secunia.com/advisories/32393
secunia.com/advisories/32759
secunia.com/advisories/32799
www.debian.org/security/2008/dsa-1653
www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.23
www.mandriva.com/security/advisories?name=MDVSA-2008:220
www.openwall.com/lists/oss-security/2008/09/04/1
www.redhat.com/support/errata/RHSA-2008-0885.html
www.securityfocus.com/bid/31515
www.ubuntu.com/usn/usn-659-1
bugzilla.redhat.com/show_bug.cgi?id=461082
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10053