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X-windows remote DoS with big fonts
An X bug allows all available memory to be consumed, which causes the system to freeze. The behavior can be duplicated with applications like the Gimp, we're told, but these aren't remotely exploitable. But with Mozilla, a pest can easily set up a malicious Web site which will crash unsuspecting Tuxers' boxen and cause any unsaved data in open apps to go away.
See the Mozilla: Remote DoS vulnerability on LinuxSecurity.