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CVE-2025-21773

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: can: etas_es58x: fix potential NULL pointer dereference on udev->serial The driver assumed that es58x_dev->udev->serial could n…

Published Feb 27, 2025CWE-476EPSS 0.22%

Overview

CVE-2025-21773 is a medium-severity vulnerability. It was published on February 27, 2025 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: etas_es58x: fix potential NULL pointer dereference on udev->serial

The driver assumed that es58x_dev->udev->serial could never be NULL.

While this is true on commercially available devices, an attacker

could spoof the device identity providing a NULL USB serial number.

That would trigger a NULL pointer dereference.

Add a check on es58x_dev->udev->serial before accessing it.

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/1590667a60753ee5a54871f2840ceefd4a7831faRefgit.kernel.org/stable/c/5059ea98d7bc133903d3e47ab36df6ed11d0c95fRefgit.kernel.org/stable/c/722e8e1219c8b6ac2865011fe339315d6a8d0721Refgit.kernel.org/stable/c/a1ad2109ce41c9e3912dadd07ad8a9c640064ffb

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21773?

CVE-2025-21773 is a medium-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21773?

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-2025-21773?

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-2025-21773?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21773 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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