Medium 5.5Published May 1, 2026

CVE-2026-31723usb: gadget: f_subset: Fix net_device lifecycle with device_move

Updated under an hour ago (Oct 25, 2026, 10:50 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_subset: 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, ensuring proper sysfs topology and power management ordering. To maintain compatibility with legacy composite drivers (e.g., multi.c), the bound flag is used to indicate whether the network device is shared and pre-registered during the legacy driver's bind phase.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 8cedba7c73af1369599b1111639cfeb66fe13aaa before edb08047051883591517feb5a51bf2bfd2b769fb; from 8cedba7c73af1369599b1111639cfeb66fe13aaa before 70707ce668494c4d35fe070dfbc7cc541b293107; from 8cedba7c73af1369599b1111639cfeb66fe13aaa before 9cbc4f109bb216623894d8819fb930210ed34b21; from 8cedba7c73af1369599b1111639cfeb66fe13aaa before fde29916e4cc736c4ca6c78f331e12b2c73ccafd; from 8cedba7c73af1369599b1111639cfeb66fe13aaa before 06524cd1c9011bee141a87e43ab878641ed3652b	CNA record
linux linux_kernel linux:linux_kernel	from 3.11 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; 7.0; 7.0; 7.0; and 1 more ranges	NVD

References

https://git.kernel.org/stable/c/edb08047051883591517feb5a51bf2bfd2b769fb
https://git.kernel.org/stable/c/70707ce668494c4d35fe070dfbc7cc541b293107patch
https://git.kernel.org/stable/c/9cbc4f109bb216623894d8819fb930210ed34b21patch
https://git.kernel.org/stable/c/fde29916e4cc736c4ca6c78f331e12b2c73ccafdpatch
https://git.kernel.org/stable/c/06524cd1c9011bee141a87e43ab878641ed3652bpatch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.