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This is not about the new module.  The same example can be written as:

  import types
  class A: pass
  A.__mul__ = types.MethodType(operator.mul, None, A)

If this still looks essentially like an indirect way of using the new module, here is another example:

  class A(str): __get__ = getattr
  a = A('a')
  A.a = a
  a.a

Or, as I just found out, new-style classes are again vulnerable to the older example based __call__, which was fixed for old-style classes:

  class A(object): pass
  A.__call__ = A()
  A()()

I'm not denying that these examples look convoluted :-)
My point here is that we can basically build a lot of examples based only on core (if not necessarily widely understood) language features.  It appears to go against the basic hope that CPython cannot be crashed as long as you don't use features explicitely marked as dangerous.