CVE-2020-26268

In affected versions of TensorFlow the tf.raw_ops.ImmutableConst operation
returns a constant tensor created from a memory mapped file which is assumed
immutable. However, if the type of the tensor is not an integral type, the
operation crashes the Python interpreter as it tries to write to the memory
area. If the file is too small, TensorFlow properly returns an error as the
memory area has fewer bytes than what is needed for the tensor it creates.
However, as soon as there are enough bytes, the above snippet causes a
segmentation fault. This is because the allocator used to return the buffer data
is not marked as returning an opaque handle since the needed virtual method is
not overridden. This is fixed in versions 1.15.5, 2.0.4, 2.1.3, 2.2.2, 2.3.2,
and 2.4.0.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-26268
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26268
https://github.com/tensorflow/tensorflow/commit/c1e1fc899ad5f8c725dcbb6470069890b5060bc7
https://github.com/tensorflow/tensorflow/security/advisories/GHSA-hhvc-g5hv-48c6