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usb: gadget: f_eem: Fix net_device lifecycle with device_move

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_eem: 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.

Announced Source revision 1
Original source ↗

CVE-2026-31724

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-31724

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "b29002a157940752dfed2c488b2011f63f007d71",
        "lessThan": "b1d854462510f7b7c504bfd5f8ec19c0737ed5e4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b29002a157940752dfed2c488b2011f63f007d71",
        "lessThan": "a6b8bce01a30a8c05c034bbc36c34845d65d644f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b29002a157940752dfed2c488b2011f63f007d71",
        "lessThan": "4ccdccff8febc5456aff684627f9a4c5c83b9346",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b29002a157940752dfed2c488b2011f63f007d71",
        "lessThan": "14730506b9e2a09d10c963a57a72ed528482fc15",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b29002a157940752dfed2c488b2011f63f007d71",
        "lessThan": "d9270c9a8118c1535409db926ac1e2545dc97b81",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/usb/gadget/function/f_eem.c",
      "drivers/usb/gadget/function/u_eem.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.81",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.22",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/usb/gadget/function/f_eem.c",
      "drivers/usb/gadget/function/u_eem.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31724

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#46242 · Revision 1
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