GHSA-gwcx-jrx4-92w2 Segfault in `simplifyBroadcast` in Tensorflow

• PyPI tensorflow: >= 2.8.0-rc0, < 2.8.0 → fixed in 2.8.0 • PyPI tensorflow-cpu: >= 2.8.0-rc0, < 2.8.0 → fixed in 2.8.0 • PyPI tensorflow-gpu: >= 2.8.0-rc0, < 2.8.0 → fixed in 2.8.0

Impact The `simplifyBroadcast` function in the MLIR-TFRT infrastructure in TensorFlow is vulnerable to a segfault (hence, denial of service), if called with scalar shapes. ```cc size_t maxRank = 0; for (auto shape : llvm::enumerate(shapes)) { auto found_shape = analysis.dimensionsForShapeTensor(shape.value()); if (!found_shape) return {}; shapes_found.push_back(*found_shape); maxRank = std::max(maxRank, found_shape->size()); } SmallVector joined_dimensions(maxRank); ``` If all shapes are scalar, then `maxRank` is 0, so we build an empty `SmallVector`. Patches We have patched the issue in GitHub commit 35f0fabb4c178253a964d7aabdbb15c6a398b69a. The fix will be included in TensorFlow 2.8.0. This is the only affected version. For more information Please consult our security guide for more information regarding the security model and how to contact us with issues and questions.