CVE-2026-31721 (GCVE-0-2026-31721)
Vulnerability from cvelistv5
Published
2026-05-01 14:14
Modified
2026-05-02 06:14
Severity ?
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
Impacted products
Vendor Product Version
Linux Linux Version: cb382536052fcc7713988869b54a81137069e5a9
Version: cb382536052fcc7713988869b54a81137069e5a9
Version: cb382536052fcc7713988869b54a81137069e5a9
Version: cb382536052fcc7713988869b54a81137069e5a9
Version: cb382536052fcc7713988869b54a81137069e5a9
Version: cb382536052fcc7713988869b54a81137069e5a9
Version: cb382536052fcc7713988869b54a81137069e5a9
Version: cb382536052fcc7713988869b54a81137069e5a9
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_hid.c"
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      "cpeApplicability": [
        {
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-02T06:14:22.498Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/13440c0db227c5db01da751ed966dde4cdd2ea18"
        },
        {
          "url": "https://git.kernel.org/stable/c/de93e0862169b5539e00c2b9980b93fd80c37c0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/81aee4500055876883658b024b6fb61801afe134"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ec6a58586f195a88479edcdb0b8027c39f12d03"
        },
        {
          "url": "https://git.kernel.org/stable/c/f7d00ee1c8082c8a134340aaf16d71a27e29c362"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d1bb391ceeebb28327703dd07af8c6324af298f"
        },
        {
          "url": "https://git.kernel.org/stable/c/26a879a41ed960b3fb4ec773ef2788c515c0e488"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2"
        }
      ],
      "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"
}


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