add .vulnerable id for several ksmbd CVEs

This commit is not necessarily where the issues were actually introduced. This
commit is where ksmbd, then named cifsd, was first introduced into the mainline
kernel, so this is just a lower barrier to denote that no older versions can be
affected.

Signed-off-by: Rolf Eike Beer <eb@emlix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>