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Low severityNVD Advisory· Published May 14, 2021· Updated Aug 3, 2024

Heap buffer overflow in `MaxPoolGrad`

CVE-2021-29579

Description

TensorFlow is an end-to-end open source platform for machine learning. The implementation of tf.raw_ops.MaxPoolGrad is vulnerable to a heap buffer overflow. The implementation(https://github.com/tensorflow/tensorflow/blob/ab1e644b48c82cb71493f4362b4dd38f4577a1cf/tensorflow/core/kernels/maxpooling_op.cc#L194-L203) fails to validate that indices used to access elements of input/output arrays are valid. Whereas accesses to input_backprop_flat are guarded by FastBoundsCheck, the indexing in out_backprop_flat can result in OOB access. The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
tensorflowPyPI
< 2.1.42.1.4
tensorflowPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflowPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflowPyPI
>= 2.4.0, < 2.4.22.4.2
tensorflow-cpuPyPI
< 2.1.42.1.4
tensorflow-cpuPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflow-cpuPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflow-cpuPyPI
>= 2.4.0, < 2.4.22.4.2
tensorflow-gpuPyPI
< 2.1.42.1.4
tensorflow-gpuPyPI
>= 2.2.0, < 2.2.32.2.3
tensorflow-gpuPyPI
>= 2.3.0, < 2.3.32.3.3
tensorflow-gpuPyPI
>= 2.4.0, < 2.4.22.4.2

Affected products

1

Patches

1
a74768f8e4ef

Prevent heap OOB error in `MaxPoolGrad`

https://github.com/tensorflow/tensorflowMihai MaruseacMay 6, 2021via ghsa
commit
1 file changed · +3 −1
  • tensorflow/core/kernels/maxpooling_op.cc+3 −1 modified
    @@ -199,7 +199,9 @@ static void SpatialMaxPoolWithArgMaxHelper(
         // CHECK(input_backprop_index >= in_start && input_backprop_index <
         // in_end)
         FastBoundsCheck(input_backprop_index - in_start, in_end - in_start);
-        input_backprop_flat(input_backprop_index) += out_backprop_flat(index);
+        if (index < out_backprop.NumElements()) {
+          input_backprop_flat(input_backprop_index) += out_backprop_flat(index);
+        }
       }
     }
   };

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

7

News mentions

0

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