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CVE-2025-21917

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: usb: renesas_usbhs: Flush the notify_hotplug_work When performing continuous unbind/bind operations on the USB drivers availabl…

Published Apr 1, 2025CWE-476EPSS 0.25%

Overview

CVE-2025-21917 is a medium-severity vulnerability. It was published on April 1, 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:

usb: renesas_usbhs: Flush the notify_hotplug_work

When performing continuous unbind/bind operations on the USB drivers

available on the Renesas RZ/G2L SoC, a kernel crash with the message

"Unable to handle kernel NULL pointer dereference at virtual address"

may occur. This issue points to the usbhsc_notify_hotplug() function.

Flush the delayed work to avoid its execution when driver resources are

unavailable.

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/3248c1f833f924246cb98ce7da4569133c1b2292Refgit.kernel.org/stable/c/394965f90454d6f00fe11879142b720c6c1a872eRefgit.kernel.org/stable/c/4ca078084cdd5f32d533311d6a0b63a60dcadd41Refgit.kernel.org/stable/c/4cd847a7b630a85493d0294ad9542c21aafaa246Refgit.kernel.org/stable/c/552ca6b87e3778f3dd5b87842f95138162e16c82Refgit.kernel.org/stable/c/830818c8e70c0364e377f0c243b28061ef7967ebRefgit.kernel.org/stable/c/d50f5c0cd949593eb9a3d822b34d7b50046a06b7Refgit.kernel.org/stable/c/e5aac1c9b2974636db7ce796ffa6de88fa08335eReflists.debian.org/debian-lts-announce/2025/05/msg00030.htmlReflists.debian.org/debian-lts-announce/2025/05/msg00045.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21917?

CVE-2025-21917 is a medium-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21917?

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-2025-21917?

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-2025-21917?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21917 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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