{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6a2968aaf50c7a22fced77a5e24aa636281efca8"
            },
            {
              "fixed": "7ed00a3edc8597fe2333f524401e2889aa1b5edf"
            },
            {
              "fixed": "5eef9ebec7f5738f12cadede3545c05b34bf5ac3"
            },
            {
              "fixed": "ca54e904a071aa65ef3ad46ba42d51aaac6b73b4"
            },
            {
              "fixed": "eb435d150ca74b4d40f77f1a2266f3636ed64a79"
            },
            {
              "fixed": "1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289"
            },
            {
              "fixed": "d89b74bf08f067b55c03d7f999ba0a0e73177eb3"
            },
            {
              "fixed": "09143c0e8f3b03517e6233aad42f45c794d8df8e"
            },
            {
              "fixed": "4527025d440ce84bf56e75ce1df2e84cb8178616"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.2.0"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.131"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31509.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: nci: fix circular locking dependency in nci_close_device\n\nnci_close_device() flushes rx_wq and tx_wq while holding req_lock.\nThis causes a circular locking dependency because nci_rx_work()\nrunning on rx_wq can end up taking req_lock too:\n\n  nci_rx_work -\u003e nci_rx_data_packet -\u003e nci_data_exchange_complete\n    -\u003e __sk_destruct -\u003e rawsock_destruct -\u003e nfc_deactivate_target\n    -\u003e nci_deactivate_target -\u003e nci_request -\u003e mutex_lock(\u0026ndev-\u003ereq_lock)\n\nMove the flush of rx_wq after req_lock has been released.\nThis should safe (I think) because NCI_UP has already been cleared\nand the transport is closed, so the work will see it and return\n-ENETDOWN.\n\nNIPA has been hitting this running the nci selftest with a debug\nkernel on roughly 4% of the runs.",
  "id": "CVE-2026-31509",
  "modified": "2026-07-08T05:35:51.754032116Z",
  "published": "2026-04-22T13:54:27.436Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09143c0e8f3b03517e6233aad42f45c794d8df8e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1edc12d2bbcb7a8d0f1088e6fccb9d8c01bb1289"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4527025d440ce84bf56e75ce1df2e84cb8178616"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5eef9ebec7f5738f12cadede3545c05b34bf5ac3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ed00a3edc8597fe2333f524401e2889aa1b5edf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca54e904a071aa65ef3ad46ba42d51aaac6b73b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d89b74bf08f067b55c03d7f999ba0a0e73177eb3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb435d150ca74b4d40f77f1a2266f3636ed64a79"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31509.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31509"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "nfc: nci: fix circular locking dependency in nci_close_device"
}