The init.d script for the X.Org X11 xfs font server on various Linux distributions might allow local users to change the permissions of arbitrary files via a symlink attack on the /tmp/.font-unix temporary file.
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00096.html
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00095.html
https://www.exploit-db.com/exploits/5167
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10802
https://issues.rpath.com/browse/RPL-1485
https://exchange.xforce.ibmcloud.com/vulnerabilities/35375
http://www.securitytracker.com/id?1018375
http://www.securityfocus.com/bid/24888
http://www.securityfocus.com/archive/1/473869/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2007-0520.html
http://www.redhat.com/support/errata/RHSA-2007-0519.html
http://www.debian.org/security/2007/dsa-1342
http://security.gentoo.org/glsa/glsa-200710-11.xml
http://secunia.com/advisories/35674
http://secunia.com/advisories/27240
http://secunia.com/advisories/26282
http://secunia.com/advisories/26081
http://secunia.com/advisories/26056
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=557