The seunshare_mount function in sandbox/seunshare.c in seunshare in certain Red Hat packages of policycoreutils 2.0.83 and earlier in Red Hat Enterprise Linux (RHEL) 6 and earlier and Fedora 14 and earlier mounts a new directory on top of /tmp without assigning root ownership and the sticky bit to this new directory which allows local users to replace or delete arbitrary /tmp files and consequently cause a denial of service or possibly gain privileges by running a setuid application that relies on /tmp as demonstrated by the ksu application.