The mxcsr code in Linux kernel 2.4 allows attackers to modify CPU state registers via a malformed address.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A292
http://www.turbolinux.com/security/TLSA-2003-41.txt
http://www.redhat.com/support/errata/RHSA-2003-195.html
http://www.redhat.com/support/errata/RHSA-2003-187.html
http://www.mandriva.com/security/advisories?name=MDKSA-2003:074
http://www.mandriva.com/security/advisories?name=MDKSA-2003:066
http://www.debian.org/security/2004/dsa-442
http://www.debian.org/security/2003/dsa-336
http://www.debian.org/security/2003/dsa-332