`CHECK`-failures in Tensorflow
### Impact
The implementation of `MapStage`
https://github.com/tensorflow/tensorflow/blob/5100e359aef5c8021f2e71c7b986420b85ce7b3d/tensorflow/core/kernels/map_stage_op.cc#L519-L550 is vulnerable a `CHECK`-fail if the key tensor is not a scalar:
```python
import tensorflow as tf
import numpy as np
tf.raw_ops.MapStage(
key = tf.constant(value=[4], shape= (1,2), dtype=tf.int64),
indices = np.array([[6]]),
values = np.array([-60]),
dtypes = [tf.int64], capacity=0, memory_limit=0,
container='', shared_name='', name=None
)
```
### Patches
We have patched the issue in GitHub commit f57315566d7094f322b784947093406c2aea0d7d
https://github.com/tensorflow/tensorflow/commit/f57315566d7094f322b784947093406c2aea0d7d.
The fix will be included in TensorFlow 2.8.0. We will also cherrypick this commit on TensorFlow 2.7.1, TensorFlow 2.6.3, and TensorFlow 2.5.3, as these are also affected and still in supported range.
### For more information
Please consult our security guide
https://github.com/tensorflow/tensorflow/blob/master/SECURITY.md for more information regarding the security model and how to contact us with issues and questions.
### Attribution
This vulnerability has been reported by Faysal Hossain Shezan from University of Virginia.
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