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CVE-2026-31723

usb: gadget: f_subset: Fix net_device lifecycle with device_move

Description

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.

Timeline

  1. ID reserved

    By Linux

  2. · 53 days later

    Published

  3. · 6 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-31723, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.16% · top 95% of all CVEs (11 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 8cedba7c73af1369599b1111639cfeb66fe13aaa – < c26916e8413c8fc44834fd9df4899312fd6cf880
    • affected 8cedba7c73af1369599b1111639cfeb66fe13aaa – < edb08047051883591517feb5a51bf2bfd2b769fb
    • affected 8cedba7c73af1369599b1111639cfeb66fe13aaa – < 70707ce668494c4d35fe070dfbc7cc541b293107
    • affected 8cedba7c73af1369599b1111639cfeb66fe13aaa – < 9cbc4f109bb216623894d8819fb930210ed34b21
    • affected 8cedba7c73af1369599b1111639cfeb66fe13aaa – < fde29916e4cc736c4ca6c78f331e12b2c73ccafd
    • affected 8cedba7c73af1369599b1111639cfeb66fe13aaa – < 06524cd1c9011bee141a87e43ab878641ed3652b
  • Linux · Linux

    • affected 3.11
    • unaffected < 3.11
    • unaffected 6.1.191 – ≤ 6.1.*
    • unaffected 6.6.160 – ≤ 6.6.*
    • unaffected 6.12.81 – ≤ 6.12.*
    • unaffected 6.18.22 – ≤ 6.18.*
    • unaffected 6.19.12 – ≤ 6.19.*
    • unaffected 7.0 – ≤ *

References

References6

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .