The compat_sys_mount function in fs/compat.c in Linux kernel 2.6.20 and earlier allows local users to cause a denial of service (NULL pointer dereference and oops) by mounting a smbfs file system in compatibility mode ("mount -t smbfs").
https://rhn.redhat.com/errata/RHSA-2007-0376.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10941
http://www.vupen.com/english/advisories/2007/2209
http://www.ubuntu.com/usn/usn-489-1
http://www.ubuntu.com/usn/usn-486-1
http://www.novell.com/linux/security/advisories/2007_43_kernel.html
http://www.novell.com/linux/security/advisories/2007_35_kernel.html
http://www.mandriva.com/security/advisories?name=MDKSA-2007:196
http://www.mandriva.com/security/advisories?name=MDKSA-2007:171
http://www.debian.org/security/2008/dsa-1504
http://support.avaya.com/elmodocs2/security/ASA-2007-287.htm
http://secunia.com/advisories/29058
http://secunia.com/advisories/26620
http://secunia.com/advisories/26289
http://secunia.com/advisories/26139
http://secunia.com/advisories/26133
http://secunia.com/advisories/25961
http://secunia.com/advisories/25838
http://secunia.com/advisories/25700
http://secunia.com/advisories/25683
http://secunia.com/advisories/25682