Vulnerability-Lookup

GHSA-P8JH-2MJP-4RWP

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-07 18:30

Details

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.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31724"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:34Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_eem: Fix net_device lifecycle with device_move\n\nThe net_device is allocated during function instance creation and\nregistered during the bind phase with the gadget device as its sysfs\nparent. When the function unbinds, the parent device is destroyed, but\nthe net_device survives, resulting in dangling sysfs symlinks:\n\nconsole:/ # ls -l /sys/class/net/usb0\nlrwxrwxrwx ... /sys/class/net/usb0 -\u003e\n/sys/devices/platform/.../gadget.0/net/usb0\nconsole:/ # ls -l /sys/devices/platform/.../gadget.0/net/usb0\nls: .../gadget.0/net/usb0: No such file or directory\n\nUse device_move() to reparent the net_device between the gadget device\ntree and /sys/devices/virtual across bind and unbind cycles. During the\nfinal unbind, calling device_move(NULL) moves the net_device to the\nvirtual device tree before the gadget device is destroyed. On rebinding,\ndevice_move() reparents the device back under the new gadget, ensuring\nproper sysfs topology and power management ordering.\n\nTo maintain compatibility with legacy composite drivers (e.g., multi.c),\nthe bound flag is used to indicate whether the network device is shared\nand pre-registered during the legacy driver\u0027s bind phase.",
  "id": "GHSA-p8jh-2mjp-4rwp",
  "modified": "2026-05-07T18:30:33Z",
  "published": "2026-05-01T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31724"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/14730506b9e2a09d10c963a57a72ed528482fc15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ccdccff8febc5456aff684627f9a4c5c83b9346"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6b8bce01a30a8c05c034bbc36c34845d65d644f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d9270c9a8118c1535409db926ac1e2545dc97b81"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31724 (GCVE-0-2026-31724)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-01 14:14

Title

usb: gadget: f_eem: Fix net_device lifecycle with device_move

Summary

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.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/a6b8bce01a30a8c05…
	https://git.kernel.org/stable/c/4ccdccff8febc5456…
	https://git.kernel.org/stable/c/14730506b9e2a09d1…
	https://git.kernel.org/stable/c/d9270c9a8118c1535…

Impacted products

Vendor

Product

Version

Linux

Affected: b29002a157940752dfed2c488b2011f63f007d71 , < a6b8bce01a30a8c05c034bbc36c34845d65d644f (git)
Affected: b29002a157940752dfed2c488b2011f63f007d71 , < 4ccdccff8febc5456aff684627f9a4c5c83b9346 (git)
Affected: b29002a157940752dfed2c488b2011f63f007d71 , < 14730506b9e2a09d10c963a57a72ed528482fc15 (git)
Affected: b29002a157940752dfed2c488b2011f63f007d71 , < d9270c9a8118c1535409db926ac1e2545dc97b81 (git)

Linux

Affected: 3.11
Unaffected: 0 , < 3.11 (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_eem.c",
            "drivers/usb/gadget/function/u_eem.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a6b8bce01a30a8c05c034bbc36c34845d65d644f",
              "status": "affected",
              "version": "b29002a157940752dfed2c488b2011f63f007d71",
              "versionType": "git"
            },
            {
              "lessThan": "4ccdccff8febc5456aff684627f9a4c5c83b9346",
              "status": "affected",
              "version": "b29002a157940752dfed2c488b2011f63f007d71",
              "versionType": "git"
            },
            {
              "lessThan": "14730506b9e2a09d10c963a57a72ed528482fc15",
              "status": "affected",
              "version": "b29002a157940752dfed2c488b2011f63f007d71",
              "versionType": "git"
            },
            {
              "lessThan": "d9270c9a8118c1535409db926ac1e2545dc97b81",
              "status": "affected",
              "version": "b29002a157940752dfed2c488b2011f63f007d71",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_eem.c",
            "drivers/usb/gadget/function/u_eem.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.11"
            },
            {
              "lessThan": "3.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_eem: Fix net_device lifecycle with device_move\n\nThe net_device is allocated during function instance creation and\nregistered during the bind phase with the gadget device as its sysfs\nparent. When the function unbinds, the parent device is destroyed, but\nthe net_device survives, resulting in dangling sysfs symlinks:\n\nconsole:/ # ls -l /sys/class/net/usb0\nlrwxrwxrwx ... /sys/class/net/usb0 -\u003e\n/sys/devices/platform/.../gadget.0/net/usb0\nconsole:/ # ls -l /sys/devices/platform/.../gadget.0/net/usb0\nls: .../gadget.0/net/usb0: No such file or directory\n\nUse device_move() to reparent the net_device between the gadget device\ntree and /sys/devices/virtual across bind and unbind cycles. During the\nfinal unbind, calling device_move(NULL) moves the net_device to the\nvirtual device tree before the gadget device is destroyed. On rebinding,\ndevice_move() reparents the device back under the new gadget, ensuring\nproper sysfs topology and power management ordering.\n\nTo maintain compatibility with legacy composite drivers (e.g., multi.c),\nthe bound flag is used to indicate whether the network device is shared\nand pre-registered during the legacy driver\u0027s bind phase."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-01T14:14:25.544Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a6b8bce01a30a8c05c034bbc36c34845d65d644f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ccdccff8febc5456aff684627f9a4c5c83b9346"
        },
        {
          "url": "https://git.kernel.org/stable/c/14730506b9e2a09d10c963a57a72ed528482fc15"
        },
        {
          "url": "https://git.kernel.org/stable/c/d9270c9a8118c1535409db926ac1e2545dc97b81"
        }
      ],
      "title": "usb: gadget: f_eem: Fix net_device lifecycle with device_move",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31724",
    "datePublished": "2026-05-01T14:14:25.544Z",
    "dateReserved": "2026-03-09T15:48:24.134Z",
    "dateUpdated": "2026-05-01T14:14:25.544Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-P8JH-2MJP-4RWP

CVE-2026-31724 (GCVE-0-2026-31724)

Tags

Sightings

Nomenclature