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CVE-2025-21835

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: fix MIDI Streaming descriptor lengths While the MIDI jacks are configured correctly, and the MIDIStreaming…

Published Mar 7, 2025EPSS 0.23%

Overview

CVE-2025-21835 is a medium-severity vulnerability. It was published on March 7, 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: gadget: f_midi: fix MIDI Streaming descriptor lengths

While the MIDI jacks are configured correctly, and the MIDIStreaming

endpoint descriptors are filled with the correct information,

bNumEmbMIDIJack and bLength are set incorrectly in these descriptors.

This does not matter when the numbers of in and out ports are equal, but

when they differ the host will receive broken descriptors with

uninitialized stack memory leaking into the descriptor for whichever

value is smaller.

The precise meaning of "in" and "out" in the port counts is not clearly

defined and can be confusing. But elsewhere the driver consistently

uses this to match the USB meaning of IN and OUT viewed from the host,

so that "in" ports send data to the host and "out" ports receive data

from 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/3a983390d14e8498f303fc5cb23ab7d696b815dbRefgit.kernel.org/stable/c/6ae6dee9f005a2f3b739b85abb6f14a0935699e0Refgit.kernel.org/stable/c/6b16761a928796e4b49e89a0b1ac284155172726Refgit.kernel.org/stable/c/9f36a89dcb78cb7e37f487b04a16396ac18c0636Refgit.kernel.org/stable/c/9f6860a9c11301b052225ca8825f8d2b1a5825bfRefgit.kernel.org/stable/c/a2d0694e1f111379c1efdf439dadd3cfd959fe9dRefgit.kernel.org/stable/c/d8e86700c8a8cf415e300a0921acd6a8f9b494f8Refgit.kernel.org/stable/c/da1668997052ed1cb00322e1f3b63702615c9429Reflists.debian.org/debian-lts-announce/2025/03/msg00028.htmlReflists.debian.org/debian-lts-announce/2025/05/msg00030.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21835?

CVE-2025-21835 is a medium-severity vulnerability. It was published on March 7, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21835?

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-2025-21835?

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-2025-21835?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21835 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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