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CVE-2025-21746

4.7 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: Input: synaptics - fix crash when enabling pass-through port When enabling a pass-through port an interrupt might come before p…

Published Feb 27, 2025CWE-367EPSS 0.15%

Overview

CVE-2025-21746 is a medium-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, 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:

Input: synaptics - fix crash when enabling pass-through port

When enabling a pass-through port an interrupt might come before psmouse

driver binds to the pass-through port. However synaptics sub-driver

tries to access psmouse instance presumably associated with the

pass-through port to figure out if only 1 byte of response or entire

protocol packet needs to be forwarded to the pass-through port and may

crash if psmouse instance has not been attached to the port yet.

Fix the crash by introducing open() and close() methods for the port and

check if the port is open before trying to access psmouse instance.

Because psmouse calls serio_open() only after attaching psmouse instance

to serio port instance this prevents the potential crash.

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/08bd5b7c9a2401faabdaa1472d45c7de0755fd7eRefgit.kernel.org/stable/c/3e179d3f1ada963475395d81bfe91daef4d1a24cRefgit.kernel.org/stable/c/87da1ea93ec9f9f0004e5b12e78789bc94e360bfRefgit.kernel.org/stable/c/a2cbcd70133dc0d4d4c95ad4cd5412b935354c7c

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21746?

CVE-2025-21746 is a medium-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2025-21746?

This vulnerability has a CVSS 3.1 base score of 4.7, 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-2025-21746?

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-2025-21746?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21746 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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