CVE-2020-26268

Description

In affected versions of TensorFlow the tf.raw_ops.ImmutableConst operation returns a constant tensor created from a memory mapped file which is assumed immutable. However, if the type of the tensor is not an integral type, the operation crashes the Python interpreter as it tries to write to the memory area. If the file is too small, TensorFlow properly returns an error as the memory area has fewer bytes than what is needed for the tensor it creates. However, as soon as there are enough bytes, the above snippet causes a segmentation fault. This is because the allocator used to return the buffer data is not marked as returning an opaque handle since the needed virtual method is not overridden. This is fixed in versions 1.15.5, 2.0.4, 2.1.3, 2.2.2, 2.3.2, and 2.4.0.

How to fix CVE-2020-26268

To remediate CVE-2020-26268, upgrade the affected package to a fixed version below.

• —upgrade to 1.15.5 or later
• —upgrade to 1.15.5 or later
• —upgrade to c1e1fc899ad5f8c725dcbb6470069890b5060bc7 or later
• —upgrade to c1e1fc899ad5f8c725dcbb6470069890b5060bc7 or later
• —upgrade to 1.15.5 or later
• —upgrade to c1e1fc899ad5f8c725dcbb6470069890b5060bc7 or later
• —upgrade to 1.15.5 or later

Is CVE-2020-26268 being exploited?

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

Affected packages (7)

• from 0, < 1.15.5, >= 2.0.0, < 2.0.4, >= 2.1.0, < 2.1.3, >= 2.2.0, < 2.2.2, >= 2.3.0, < 2.3.2
• from 0, < 1.15.5
• from 0, < c1e1fc899ad5f8c725dcbb6470069890b5060bc7 | from 0, < 1.15.5, >= 2.0.0, < 2.0.4, >= 2.1.0, < 2.1.3, >= 2.2.0, < 2.2.2, >= 2.3.0, < 2.3.2
• from 0, < c1e1fc899ad5f8c725dcbb6470069890b5060bc7 | from 0, < 1.15.5, >= 2.0.0, < 2.0.4, >= 2.1.0, < 2.1.3, >= 2.2.0, < 2.2.2, >= 2.3.0, < 2.3.2
• from 0, < 1.15.5
• from 0, < c1e1fc899ad5f8c725dcbb6470069890b5060bc7 | from 0, < 1.15.5, >= 2.0.0, < 2.0.4, >= 2.1.0, < 2.1.3, >= 2.2.0, < 2.2.2, >= 2.3.0, < 2.3.2
• from 0, < 1.15.5

CVSS scores

References (7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-26268
• PATCHgithub.com/tensorflow/tensorflow
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow-cpu/PYSEC-2020-299.yaml
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/tensorflow-gpu/PYSEC-2020-334.yaml