The BIND 4 and BIND 8.2.x stub resolver libraries, and other libraries such as glibc 2.2.5 and earlier, libc, and libresolv, use the maximum buffer size instead of the actual size when processing a DNS response, which causes the stub resolvers to read past the actual boundary ("read buffer overflow"), allowing remote attackers to cause a denial of service (crash).
http://www.redhat.com/support/errata/RHSA-2003-212.html
http://www.redhat.com/support/errata/RHSA-2003-022.html
http://www.redhat.com/support/errata/RHSA-2002-258.html
http://www.redhat.com/support/errata/RHSA-2002-197.html
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2004:009
http://www.kb.cert.org/vuls/id/738331
http://www.iss.net/security_center/static/10295.php
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000535