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CVE-2025-21776

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: USB: hub: Ignore non-compliant devices with too many configs or interfaces Robert Morris created a test program which can cause…

Published Feb 27, 2025CWE-476EPSS 0.28%

Overview

CVE-2025-21776 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:

USB: hub: Ignore non-compliant devices with too many configs or interfaces

Robert Morris created a test program which can cause

usb_hub_to_struct_hub() to dereference a NULL or inappropriate

pointer:

Oops: general protection fault, probably for non-canonical address

0xcccccccccccccccc: 0000 [#1] SMP DEBUG_PAGEALLOC PTI

CPU: 7 UID: 0 PID: 117 Comm: kworker/7:1 Not tainted 6.13.0-rc3-00017-gf44d154d6e3d #14

Hardware name: FreeBSD BHYVE/BHYVE, BIOS 14.0 10/17/2021

Workqueue: usb_hub_wq hub_event

RIP: 0010:usb_hub_adjust_deviceremovable+0x78/0x110

...

Call Trace:

<TASK>

? die_addr+0x31/0x80

? exc_general_protection+0x1b4/0x3c0

? asm_exc_general_protection+0x26/0x30

? usb_hub_adjust_deviceremovable+0x78/0x110

hub_probe+0x7c7/0xab0

usb_probe_interface+0x14b/0x350

really_probe+0xd0/0x2d0

? __pfx___device_attach_driver+0x10/0x10

__driver_probe_device+0x6e/0x110

driver_probe_device+0x1a/0x90

__device_attach_drive

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/2240fed37afbcdb5e8b627bc7ad986891100e05dRefgit.kernel.org/stable/c/49f077106fa07919a6a6dda99bb490dd1d1a8218Refgit.kernel.org/stable/c/5b9778e1fe715700993ce436c152dc3b7df0b490Refgit.kernel.org/stable/c/62d8f4c5454dd39aded4f343720d1c5a1803cfefRefgit.kernel.org/stable/c/c3720b04df84b5459050ae4e03ec7d545652f897Refgit.kernel.org/stable/c/d343fe0fad5c1d689775f2dda24a85ce98e29566Refgit.kernel.org/stable/c/d3a67adb365cdfdac4620daf38a82e57ca45806cRefgit.kernel.org/stable/c/e905a0fca7bff0855d312c16f71e60e1773b393eReflists.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-2025-21776?

CVE-2025-21776 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-2025-21776?

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-2025-21776?

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-2025-21776?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21776 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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