smbfs in Linux kernel 2.6.8 and other versions, and 2.4.x before 2.4.34, when UNIX extensions are enabled, ignores certain mount options, which could cause clients to use server-specified uid, gid and mode settings.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10171
http://www.us.debian.org/security/2006/dsa-1237
http://www.securityfocus.com/bid/21523
http://www.novell.com/linux/security/advisories/2007_35_kernel.html
http://www.debian.org/security/2006/dsa-1233
http://secunia.com/advisories/25683
http://secunia.com/advisories/23395