Vulnerability-Lookup

FKIE_CVE-2026-31721

Vulnerability from fkie_nvd - Published: 2026-05-01 15:16 - Updated: 2026-05-06 20:56

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: move list and spinlock inits from bind to alloc There was an issue when you did the following: - setup and bind an hid gadget - open /dev/hidg0 - use the resulting fd in EPOLL_CTL_ADD - unbind the UDC - bind the UDC - use the fd in EPOLL_CTL_DEL When CONFIG_DEBUG_LIST was enabled, a list_del corruption was reported within remove_wait_queue (via ep_remove_wait_queue). After some debugging I found out that the queues, which f_hid registers via poll_wait were the problem. These were initialized using init_waitqueue_head inside hidg_bind. So effectively, the bind function re-initialized the queues while there were still items in them. The solution is to move the initialization from hidg_bind to hidg_alloc to extend their lifetimes to the lifetime of the function instance. Additionally, I found many other possibly problematic init calls in the bind function, which I moved as well.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/13440c0db227c5db01da751ed966dde4cdd2ea18	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/26a879a41ed960b3fb4ec773ef2788c515c0e488	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5d1bb391ceeebb28327703dd07af8c6324af298f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/81aee4500055876883658b024b6fb61801afe134	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8ec6a58586f195a88479edcdb0b8027c39f12d03	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/de93e0862169b5539e00c2b9980b93fd80c37c0d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f7d00ee1c8082c8a134340aaf16d71a27e29c362	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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  "id": "CVE-2026-31721",
  "lastModified": "2026-05-06T20:56:34.973",
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          "confidentialityImpact": "NONE",
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}

CVE-2026-31721 (GCVE-0-2026-31721)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-02 06:14

Title

usb: gadget: f_hid: move list and spinlock inits from bind to alloc

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/13440c0db227c5db0…
	https://git.kernel.org/stable/c/de93e0862169b5539…
	https://git.kernel.org/stable/c/81aee450005587688…
	https://git.kernel.org/stable/c/8ec6a58586f195a88…
	https://git.kernel.org/stable/c/f7d00ee1c8082c8a1…
	https://git.kernel.org/stable/c/5d1bb391ceeebb283…
	https://git.kernel.org/stable/c/26a879a41ed960b3f…
	https://git.kernel.org/stable/c/4e0a88254ad59f6c5…

Impacted products

Vendor

Product

Version

Linux

Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 13440c0db227c5db01da751ed966dde4cdd2ea18 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < de93e0862169b5539e00c2b9980b93fd80c37c0d (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 81aee4500055876883658b024b6fb61801afe134 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 8ec6a58586f195a88479edcdb0b8027c39f12d03 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < f7d00ee1c8082c8a134340aaf16d71a27e29c362 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 5d1bb391ceeebb28327703dd07af8c6324af298f (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 26a879a41ed960b3fb4ec773ef2788c515c0e488 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 4e0a88254ad59f6c53a34bf5fa241884ec09e8b2 (git)

Linux

Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.169 , ≤ 6.1.* (semver)
Unaffected: 6.6.135 , ≤ 6.6.* (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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_hid.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_hid: move list and spinlock inits from bind to alloc\n\nThere was an issue when you did the following:\n- setup and bind an hid gadget\n- open /dev/hidg0\n- use the resulting fd in EPOLL_CTL_ADD\n- unbind the UDC\n- bind the UDC\n- use the fd in EPOLL_CTL_DEL\n\nWhen CONFIG_DEBUG_LIST was enabled, a list_del corruption was reported\nwithin remove_wait_queue (via ep_remove_wait_queue). After some\ndebugging I found out that the queues, which f_hid registers via\npoll_wait were the problem. These were initialized using\ninit_waitqueue_head inside hidg_bind. So effectively, the bind function\nre-initialized the queues while there were still items in them.\n\nThe solution is to move the initialization from hidg_bind to hidg_alloc\nto extend their lifetimes to the lifetime of the function instance.\n\nAdditionally, I found many other possibly problematic init calls in the\nbind function, which I moved as well."
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      "providerMetadata": {
        "dateUpdated": "2026-05-02T06:14:22.498Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2"
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      "title": "usb: gadget: f_hid: move list and spinlock inits from bind to alloc",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31721",
    "datePublished": "2026-05-01T14:14:23.492Z",
    "dateReserved": "2026-03-09T15:48:24.134Z",
    "dateUpdated": "2026-05-02T06:14:22.498Z",
    "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

FKIE_CVE-2026-31721

CVE-2026-31721 (GCVE-0-2026-31721)

Tags

Sightings

Nomenclature