Linux kernel 2.2.1 through 2.2.19, and 2.4.1 through 2.4.10, allows local users to cause a denial of service via a series of deeply nested symlinks, which causes the kernel to spend extra time when trying to access the link.
http://www.securityfocus.com/bid/3444
http://www.linuxsecurity.com/advisories/other_advisory-1650.html
http://marc.info/?l=bugtraq&m=100350685431610&w=2
http://marc.info/?l=bugtraq&m=100343090106914&w=2
http://frontal2.mandriva.com/security/advisories?name=MDKSA-2001:079