CVE-2026-31725

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: f_ecm: Fix net_device lifecycle with device_move

The net_device is allocated during function instance creation and

registered during the bind phase with the gadget device as its sysfs

parent. When the function unbinds, the parent device is destroyed, but

the net_device survives, resulting in dangling sysfs symlinks:

console:/ # ls -l /sys/class/net/usb0

lrwxrwxrwx ... /sys/class/net/usb0 ->

/sys/devices/platform/.../gadget.0/net/usb0

console:/ # ls -l /sys/devices/platform/.../gadget.0/net/usb0

ls: .../gadget.0/net/usb0: No such file or directory

Use device_move() to reparent the net_device between the gadget device

tree and /sys/devices/virtual across bind and unbind cycles. During the

final unbind, calling device_move(NULL) moves the net_device to the

virtual device tree before the gadget device is destroyed. On rebinding,

device_move() reparents the device back under the new gadget, ensuri

/// 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