CVE-2021-41219

Description

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.

How to fix CVE-2021-41219

To remediate CVE-2021-41219, upgrade the affected package to a fixed version below.

—upgrade to 2.4.4 or later
—upgrade to 2.6.1 or later
—upgrade to e6cf28c72ba2eb949ca950d834dd6d66bb01cfae or later
—upgrade to e6cf28c72ba2eb949ca950d834dd6d66bb01cfae or later
—upgrade to 2.6.1 or later
—upgrade to e6cf28c72ba2eb949ca950d834dd6d66bb01cfae or later
—upgrade to 2.6.1 or later

Is CVE-2021-41219 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (7)

from 0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1
>= 2.6.0, < 2.6.1
from 0, < e6cf28c72ba2eb949ca950d834dd6d66bb01cfae | from 0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1, >= 2.7.0rc0, < 2.7.0
from 0, < e6cf28c72ba2eb949ca950d834dd6d66bb01cfae | from 0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1, >= 2.7.0rc0, < 2.7.0
>= 2.6.0, < 2.6.1
from 0, < e6cf28c72ba2eb949ca950d834dd6d66bb01cfae | from 0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1, >= 2.7.0rc0, < 2.7.0
>= 2.6.0, < 2.6.1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H