suid-binary vulnerabilities

It's part of glibc, and is bloody useful e.g. to put your dynamic linker symlink back in place if something blows it away. Since this is its primary purpose, perhaps some distros don't ship it... but if you don't have that I hope you have sash or busybox or something else statically linked to recover your system in case of disaster. (OK, a boot CD/USB key could do the same job but is somewhat inelegant.)