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TI-2021-18058 Aliases CVE-2021-41219GHSA-4f99-p9c2-3j8x

Undefined behavior via `nullptr` reference binding in sparse matrix multiplication

Priority LOW 33CWE-824Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-824 and the CVSS impact.

Summary

TensorFlow is an open source platform for machine learning. In affected versions the code for sparse matrix multiplication is vulnerable to undefined behavior via binding a reference to `nullptr`. This occurs whenever the dimensions of `a` or `b` are 0 or less. In the case on one of these is 0, an empty output tensor should be allocated (to conserve the invariant that output tensors are always allocated when the operation is successful) but nothing should be written to it (that is, we should return early from the kernel implementation). Otherwise, attempts to write to this empty tensor would result in heap OOB access. The fix will be included in TensorFlow 2.7.0. We will also cherrypick this commit on TensorFlow 2.6.1, TensorFlow 2.5.2, and TensorFlow 2.4.4, as these are also affected and still in supported range.

Why it matters now

EPSS 0.00211 11th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed tensorflow (tensorflow): 2.6.1, 2.5.2, 2.4.4tensorflow (PyPI): 2.6.1, 2.5.2, 2.4.4+2 more products

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Googletensorflow2.6.0 to before 2.6.1; 2.5.0 to before 2.5.2; before 2.4.42.6.1, 2.5.2, 2.4.4Patch availableCNA
—tensorflow (PyPI)2.6.0 to before 2.6.12.6.1Patch availableGHSA-4f99-p9c2-3j8x
—tensorflow (PyPI)2.5.0 to before 2.5.22.5.2Patch availableGHSA-4f99-p9c2-3j8x
—tensorflow (PyPI)before 2.4.42.4.4Patch availableGHSA-4f99-p9c2-3j8x
—tensorflow-cpu (PyPI)2.6.0 to before 2.6.12.6.1Patch availableGHSA-4f99-p9c2-3j8x
—tensorflow-cpu (PyPI)2.5.0 to before 2.5.22.5.2Patch availableGHSA-4f99-p9c2-3j8x
—tensorflow-cpu (PyPI)before 2.4.42.4.4Patch availableGHSA-4f99-p9c2-3j8x
—tensorflow-gpu (PyPI)2.6.0 to before 2.6.12.6.1Patch availableGHSA-4f99-p9c2-3j8x
—tensorflow-gpu (PyPI)2.5.0 to before 2.5.22.5.2Patch availableGHSA-4f99-p9c2-3j8x
—tensorflow-gpu (PyPI)before 2.4.42.4.4Patch availableGHSA-4f99-p9c2-3j8x
  • tensorflow VendorGoogle Affected 2.6.0 to before 2.6.1; 2.5.0 to before 2.5.2; before 2.4.4 Fixed in 2.6.1, 2.5.2, 2.4.4 Patch available CNA
  • tensorflow (PyPI) Vendor— Affected 2.6.0 to before 2.6.1 Fixed in 2.6.1 Patch available GHSA-4f99-p9c2-3j8x
  • tensorflow (PyPI) Vendor— Affected 2.5.0 to before 2.5.2 Fixed in 2.5.2 Patch available GHSA-4f99-p9c2-3j8x
  • tensorflow (PyPI) Vendor— Affected before 2.4.4 Fixed in 2.4.4 Patch available GHSA-4f99-p9c2-3j8x
  • tensorflow-cpu (PyPI) Vendor— Affected 2.6.0 to before 2.6.1 Fixed in 2.6.1 Patch available GHSA-4f99-p9c2-3j8x
  • tensorflow-cpu (PyPI) Vendor— Affected 2.5.0 to before 2.5.2 Fixed in 2.5.2 Patch available GHSA-4f99-p9c2-3j8x
  • tensorflow-cpu (PyPI) Vendor— Affected before 2.4.4 Fixed in 2.4.4 Patch available GHSA-4f99-p9c2-3j8x
  • tensorflow-gpu (PyPI) Vendor— Affected 2.6.0 to before 2.6.1 Fixed in 2.6.1 Patch available GHSA-4f99-p9c2-3j8x
  • tensorflow-gpu (PyPI) Vendor— Affected 2.5.0 to before 2.5.2 Fixed in 2.5.2 Patch available GHSA-4f99-p9c2-3j8x
  • tensorflow-gpu (PyPI) Vendor— Affected before 2.4.4 Fixed in 2.4.4 Patch available GHSA-4f99-p9c2-3j8x

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:*before 2.4.4; 2.5.0 to before 2.5.2VulnerableGoogle
cpe:2.3:a:google:tensorflow:2.6.0:*:*:*:*:*:*:*2.6.0VulnerableGoogle
  • cpe:2.3:a:google:tensorflow:*:*:*:*:*:*:*:* Versions before 2.4.4; 2.5.0 to before 2.5.2 Vulnerable ·Google
  • cpe:2.3:a:google:tensorflow:2.6.0:*:*:*:*:*:*:* Versions 2.6.0 Vulnerable ·Google

Remediation

  • Fix · CNA tensorflow (tensorflow) Fixed in 2.6.1, 2.5.2, 2.4.4
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow (PyPI) Fixed in 2.6.1 Advisory →
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow (PyPI) Fixed in 2.5.2 Advisory →
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow (PyPI) Fixed in 2.4.4 Advisory →
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow-cpu (PyPI) Fixed in 2.6.1 Advisory →
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow-cpu (PyPI) Fixed in 2.5.2 Advisory →
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow-cpu (PyPI) Fixed in 2.4.4 Advisory →
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow-gpu (PyPI) Fixed in 2.6.1 Advisory →
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow-gpu (PyPI) Fixed in 2.5.2 Advisory →
  • Fix · GHSA-4f99-p9c2-3j8x tensorflow-gpu (PyPI) Fixed in 2.4.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41219
  2. 2026-10-03 Alias added: GHSA-4f99-p9c2-3j8x

References

Exploit 1

Patch 1

Advisory 1

Other 4

  • TI-2022-20241 FractionalMaxPool and FractionalAVGPool heap out-of-bounds acess in Tensorflow CVSS 3.1CRITICAL 9.8
  • TI-2022-07640 Integer overflow in Tensorflow CVSS 3.1CRITICAL 9.8
  • TI-2022-07627 Out of bounds read and write in Tensorflow CVSS 3.1HIGH 8.8
  • TI-2022-07619 Out of bounds write in Tensorflow CVSS 3.1HIGH 8.8
  • TI-2022-07613 Read and Write outside of bounds in TFLite CVSS 3.1HIGH 8.8
  • TI-2022-07612 Integer overflow in TFLite CVSS 3.1HIGH 8.8
See all 430 →

Sources

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