The C-Media PCI sound driver in Linux before 2.4.21 does not use the get_user function to access userspace, which crosses security boundaries and may facilitate the exploitation of vulnerabilities, a different vulnerability than CVE-2003-0700.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A387
http://www.redhat.com/support/errata/RHSA-2003-239.html