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CVE-2021-46994

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: can: mcp251x: fix resume from sleep before interface was brought up Since 8ce8c0abcba3 the driver queues work via priv->restart…

Published Feb 28, 2024CWE-476EPSS 0.24%

Overview

CVE-2021-46994 is a medium-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

can: mcp251x: fix resume from sleep before interface was brought up

Since 8ce8c0abcba3 the driver queues work via priv->restart_work when

resuming after suspend, even when the interface was not previously

enabled. This causes a null dereference error as the workqueue is only

allocated and initialized in mcp251x_open().

To fix this we move the workqueue init to mcp251x_can_probe() as there

is no reason to do it later and repeat it whenever mcp251x_open() is

called.

[mkl: fix error handling in mcp251x_stop()]

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/03c427147b2d3e503af258711af4fc792b89b0afRefgit.kernel.org/stable/c/6f8f1c27b577de15f69fefce3c502bb6300d825cRefgit.kernel.org/stable/c/e1e10a390fd9479209c4d834d916ca5e6d5d396bRefgit.kernel.org/stable/c/eecb4df8ec9f896b19ee05bfa632ac6c1dcd8f21Refgit.kernel.org/stable/c/03c427147b2d3e503af258711af4fc792b89b0afRefgit.kernel.org/stable/c/6f8f1c27b577de15f69fefce3c502bb6300d825cRefgit.kernel.org/stable/c/e1e10a390fd9479209c4d834d916ca5e6d5d396bRefgit.kernel.org/stable/c/eecb4df8ec9f896b19ee05bfa632ac6c1dcd8f21

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46994?

CVE-2021-46994 is a medium-severity vulnerability. It was published on February 28, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46994?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46994?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-46994?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46994 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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