Improper Link Resolution Before File Access ('Link Following')
Linux kernel 2.6, when using vservers, allows local users to access resources of other vservers via a symlink attack in /proc.
CWE-59 - Improper Link Resolution Before File Access
'Improper link resolution before file access' occurs when software accesses a file resource but fails to verify that the file isn't a link or shortcut to another file. An attacker can potentially gain access to arbitrary files and from there the impact can vary, depending on the application, from sensitive data exposure to remote code execution.