CVE-2021-41213
Deadlock in mutually recursive `tf.function` objects
Description
TensorFlow is an open source platform for machine learning. In affected versions the code behind `tf.function` API can be made to deadlock when two `tf.function` decorated Python functions are mutually recursive. This occurs due to using a non-reentrant `Lock` Python object. Loading any model which contains mutually recursive functions is vulnerable. An attacker can cause denial of service by causing users to load such models and calling a recursive `tf.function`, although this is not a frequent scenario. 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-2021-41213
To remediate CVE-2021-41213, 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 afac8158d43691661ad083f6dd9e56f327c1dcb7 or later
- —upgrade to afac8158d43691661ad083f6dd9e56f327c1dcb7 or later
- —upgrade to 2.6.1 or later
- —upgrade to afac8158d43691661ad083f6dd9e56f327c1dcb7 or later
- —upgrade to 2.6.1 or later
Is CVE-2021-41213 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (7)
- >= 2.4.0, < 2.4.4, >= 2.5.0, < 2.5.2, >= 2.6.0, < 2.6.1
- >= 2.6.0, < 2.6.1
- from 0, < afac8158d43691661ad083f6dd9e56f327c1dcb7 | 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, < afac8158d43691661ad083f6dd9e56f327c1dcb7 | 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, < afac8158d43691661ad083f6dd9e56f327c1dcb7 | 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 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |