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CVE-2026-45923

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: usb: catc: enable basic endpoint checking catc_probe() fills three URBs with hardcoded endpoint pipes without verifying th…

Published May 27, 2026EPSS 0.16%

Overview

CVE-2026-45923 is a medium-severity vulnerability. It was published on May 27, 2026 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:

net: usb: catc: enable basic endpoint checking

catc_probe() fills three URBs with hardcoded endpoint pipes without

verifying the endpoint descriptors:

- usb_sndbulkpipe(usbdev, 1) and usb_rcvbulkpipe(usbdev, 1) for TX/RX

- usb_rcvintpipe(usbdev, 2) for interrupt status

A malformed USB device can present these endpoints with transfer types

that differ from what the driver assumes.

Add a catc_usb_ep enum for endpoint numbers, replacing magic constants

throughout. Add usb_check_bulk_endpoints() and usb_check_int_endpoints()

calls after usb_set_interface() to verify endpoint types before use,

rejecting devices with mismatched descriptors at probe time.

Similar to

- commit 90b7f2961798 ("net: usb: rtl8150: enable basic endpoint checking")

which fixed the issue in rtl8150.

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/163d04897e57633c5d2e69734e4e4b22bb63f50dRefgit.kernel.org/stable/c/1a42cfced8900d33d032c7ec338484855b61b8ccRefgit.kernel.org/stable/c/36c28b028efba0f42218d41fed12c47ce217c1f1Refgit.kernel.org/stable/c/9e7021d2aeae57c323a6f722ed7915686cdcc123Refgit.kernel.org/stable/c/a488001a8197da4f9c413eec8f6acbff71c60145Refgit.kernel.org/stable/c/ac7739b78ded519e1d9919a814da3b34120bec8cRefgit.kernel.org/stable/c/eade522d3e6ac3f3bfb51bfa5b5b4b32bd0b846f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45923?

CVE-2026-45923 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-45923?

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-2026-45923?

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-2026-45923?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45923 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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