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CVE-2026-31727

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_ether: Fix NULL pointer deref in eth_get_drvinfo Commit ec35c1969650 ("usb: gadget: f_ncm: Fix net_device lifecy…

Published May 1, 2026CWE-476EPSS 0.16%

Overview

CVE-2026-31727 is a medium-severity vulnerability. It was published on May 1, 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:

usb: gadget: u_ether: Fix NULL pointer deref in eth_get_drvinfo

Commit ec35c1969650 ("usb: gadget: f_ncm: Fix net_device lifecycle with

device_move") reparents the gadget device to /sys/devices/virtual during

unbind, clearing the gadget pointer. If the userspace tool queries on

the surviving interface during this detached window, this leads to a

NULL pointer dereference.

Unable to handle kernel NULL pointer dereference

Call trace:

eth_get_drvinfo+0x50/0x90

ethtool_get_drvinfo+0x5c/0x1f0

__dev_ethtool+0xaec/0x1fe0

dev_ethtool+0x134/0x2e0

dev_ioctl+0x338/0x560

Add a NULL check for dev->gadget in eth_get_drvinfo(). When detached,

skip copying the fw_version and bus_info strings, which is natively

handled by ethtool_get_drvinfo for empty strings.

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/0326429e8ba99892e1d1e115dc8e88e1a3b64e24Refgit.kernel.org/stable/c/7de4d46be40738c7e48e64b5cc0a34aa1e047b0aRefgit.kernel.org/stable/c/7fce959e9be3bf63bb0fdf4b05f9cc42cb289fe2Refgit.kernel.org/stable/c/a36e5e800b9c93e3e1ffa42f34d38b36775dbceeRefgit.kernel.org/stable/c/e002e92e88e12457373ed096b18716d97e7bbb20Refgit.kernel.org/stable/c/f9f987472f4b8ab177be2b6492a59278ed969479

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31727?

CVE-2026-31727 is a medium-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31727?

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-2026-31727?

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-2026-31727?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31727 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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