{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cb382536052fcc7713988869b54a81137069e5a9"
            },
            {
              "fixed": "13440c0db227c5db01da751ed966dde4cdd2ea18"
            },
            {
              "fixed": "de93e0862169b5539e00c2b9980b93fd80c37c0d"
            },
            {
              "fixed": "81aee4500055876883658b024b6fb61801afe134"
            },
            {
              "fixed": "8ec6a58586f195a88479edcdb0b8027c39f12d03"
            },
            {
              "fixed": "f7d00ee1c8082c8a134340aaf16d71a27e29c362"
            },
            {
              "fixed": "5d1bb391ceeebb28327703dd07af8c6324af298f"
            },
            {
              "fixed": "26a879a41ed960b3fb4ec773ef2788c515c0e488"
            },
            {
              "fixed": "4e0a88254ad59f6c53a34bf5fa241884ec09e8b2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.19.0"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.169"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.135"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31721.json"
  },
  "details": "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.",
  "id": "CVE-2026-31721",
  "modified": "2026-07-15T01:49:08.382853926Z",
  "published": "2026-05-01T14:14:23.492Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13440c0db227c5db01da751ed966dde4cdd2ea18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26a879a41ed960b3fb4ec773ef2788c515c0e488"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d1bb391ceeebb28327703dd07af8c6324af298f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81aee4500055876883658b024b6fb61801afe134"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ec6a58586f195a88479edcdb0b8027c39f12d03"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de93e0862169b5539e00c2b9980b93fd80c37c0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f7d00ee1c8082c8a134340aaf16d71a27e29c362"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31721.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31721"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "usb: gadget: f_hid: move list and spinlock inits from bind to alloc"
}