The VFAT compat ioctls in the Linux kernel before 2.6.21.2, when run on a 64-bit system, allow local users to corrupt a kernel_dirent struct and cause a denial of service (system crash) via unknown vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11674
https://exchange.xforce.ibmcloud.com/vulnerabilities/34669
http://www.vupen.com/english/advisories/2007/2023
http://www.ubuntu.com/usn/usn-510-1
http://www.ubuntu.com/usn/usn-489-1
http://www.ubuntu.com/usn/usn-486-1
http://www.redhat.com/support/errata/RHSA-2007-0939.html
http://www.redhat.com/support/errata/RHSA-2007-0705.html
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21.2
http://www.debian.org/security/2008/dsa-1479
http://support.avaya.com/elmodocs2/security/ASA-2007-474.htm
http://secunia.com/advisories/28626
http://secunia.com/advisories/27747
http://secunia.com/advisories/27436
http://secunia.com/advisories/26760
http://secunia.com/advisories/26139
http://secunia.com/advisories/26133