The xattr file system code, as backported in Red Hat Enterprise Linux 3 on 64-bit systems, does not properly handle certain offsets, which allows local users to cause a denial of service (system crash) via certain actions on an ext3 file system with extended attributes enabled.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11406
http://www.securityfocus.com/bid/13680
http://www.redhat.com/support/errata/RHSA-2005-294.html
http://www.debian.org/security/2005/dsa-922
http://www.debian.org/security/2005/dsa-921