The vmx86 kernel extension in VMware Fusion before 2.0.6 build 196839 does not use correct file permissions, which allows host OS users to gain privileges on the host OS via unspecified vectors.
http://www.vupen.com/english/advisories/2009/2811
http://www.vmware.com/security/advisories/VMSA-2009-0013.html
http://securitytracker.com/id?1022981
http://secunia.com/advisories/36928
http://lists.vmware.com/pipermail/security-announce/2009/000066.html