{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "50b78b2a6500d0e97c204c1b6c51df8c17358bbe"
            },
            {
              "fixed": "54adcabb0f1deef1bdae5fc64779ed6d442721c9"
            },
            {
              "fixed": "7c938aad5108382c6ad7453c4b5ee8ae3f3252ed"
            },
            {
              "fixed": "d2093a0981138876212bc5f473bdbfba0786e064"
            },
            {
              "fixed": "41256821762a7114906b178826d17098e2fa5992"
            },
            {
              "fixed": "53867f6acb1af7f12d6485fa8a2819318f89083b"
            },
            {
              "fixed": "da8a07757383614a8380a0f7dd54749d2687b82e"
            },
            {
              "fixed": "d5e1c92d09caed19f2988739695ce611a86ba6f8"
            },
            {
              "fixed": "c3eef2f988a3db9690369d7cef9a3344dd9788d3"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.7.0"
            },
            {
              "fixed": "5.10.271"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.222"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.189"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.158"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98580.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: Fix race condition in accept_queue lifecycle\n\nIn nfc_llcp_socket_release(), sockets and listener accept queues are\nwalked under the local sockets rwlock and bh_lock_sock().  However,\nbh_lock_sock() does not synchronise against process-context lock_sock()\nheld by nfc_llcp_accept_dequeue() during accept().  Because\nsocket_release() does not check sock_owned_by_user(), both paths can\nconcurrently unlink and release the same child socket, resulting in\nuse-after-free or a NULL pointer dereference of child-\u003eparent in\nnfc_llcp_accept_unlink().\n\nFix this synchronisation race by having nfc_llcp_socket_release() use\nprocess-context lock_sock() instead of bh_lock_sock():\n\n1. Pop sockets from the local sockets list under the write lock using\n   nfc_llcp_sock_list_pop() so lock_sock() can be acquired without\n   holding the rwlock.\n\n2. Because lock_sock() can sleep, defer the final release of the\n   nfc_llcp_local structure to a workqueue (release_work).  This avoids\n   a sleeping-in-atomic bug when the last local reference is dropped\n   from softirq context.  Additionally, hold a single device reference\n   on local from registration until final destruction.\n\n3. In nfc_llcp_local_get(), use kref_get_unless_zero() to prevent\n   resurrecting a local object whose teardown has been scheduled.\n\n4. In llcp_sock_accept(), verify that the listener socket state is still\n   LLCP_LISTEN after waking from schedule_timeout() to prevent hangs if\n   the listener is closed concurrently.\n\n5. When unlinking unaccepted child sockets during listener release,\n   unlink them from local-\u003esockets, call sock_orphan(), and drop their\n   initial sk_alloc creation reference via sock_put().\n\n6. Make nfc_llcp_accept_unlink() idempotent by guarding parent access with\n   a NULL check.",
  "id": "CVE-2026-98580",
  "modified": "2026-10-20T02:30:40.971988586Z",
  "published": "2026-10-18T15:18:53.819Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41256821762a7114906b178826d17098e2fa5992"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53867f6acb1af7f12d6485fa8a2819318f89083b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54adcabb0f1deef1bdae5fc64779ed6d442721c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c938aad5108382c6ad7453c4b5ee8ae3f3252ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3eef2f988a3db9690369d7cef9a3344dd9788d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2093a0981138876212bc5f473bdbfba0786e064"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5e1c92d09caed19f2988739695ce611a86ba6f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da8a07757383614a8380a0f7dd54749d2687b82e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98580.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98580"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "nfc: llcp: Fix race condition in accept_queue lifecycle"
}