{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98290",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98290"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "Bluetooth: RFCOMM: avoid socket lock inversion in listener cleanup",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: avoid socket lock inversion in listener cleanup\n\nrfcomm_sock_cleanup_listen() closes unaccepted child sockets through\nrfcomm_sock_close(), which takes the child socket lock before\nrfcomm_dlc_close() acquires rfcomm_mutex. The RFCOMM worker takes these\nlocks in reverse order while handling connections and DLC state changes,\nso lockdep reports a possible deadlock.\n\nClose dequeued children without taking their socket lock. The accept queue\nowns a reference to each child, and bt_accept_dequeue() locks the child\nwhile unlinking it and clearing its parent pointer.\n\nDropping the child lock makes it important to prevent a concurrent\nrfcomm_connect_ind() from enqueueing a new child after cleanup observes an\nempty queue. Set a listening socket to BT_CLOSED while its lock is still\nheld, before dropping the lock and draining the queue. The state check in\nrfcomm_connect_ind() then rejects new children once cleanup starts.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98290"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eb4adaa46e4c9e6efa7be3ce06398f4d7c39b57c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4aafb47301a799d3e01230d6568c4e93524e1523"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c741977e413f5b49d306700820fb55ccb8269f5a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6792c441767256030606eb82dca5d5fc360dd9a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bfce253f039eb5f58b810af267942a9f59207254"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/18174b166547ef41973cc19feb5ef9cab39a8def"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/801fb950cae7048eb7d83b18857d1ca37b8cd5a4"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-07T06:50:27Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - A Bluetooth peer drives both halves of this bug. Its RFCOMM SABM creates a child in rfcomm_connect_ind(), and its later DISC makes krfcommd call rfcomm_sk_state_change() on that child (taking lock_sock(child) under rfcomm_mutex, and dereferencing bt_sk(child)->parent). Bluetooth requires radio range, so the vector is Adjacent.\nAC:H - The peer can send SABM and DISC at will, but both the ABBA deadlock and the late-enqueue window need the victim to close its listener at that moment. That window runs from rfcomm_sock_shutdown dropping the listener lock to cleanup_listen setting BT_CLOSED, and the peer cannot control when the application closes the socket.\nPR:N - rfcomm_connect_ind() only checks for a BT_LISTEN socket on the channel and for room in the backlog before it enqueues a child, so the peer needs no credentials.\nUI:N - No victim action beyond normal operation is needed. A service closing its RFCOMM listener on its own (exit, restart, or Bluetooth teardown) is a timing condition and is counted in AC:H.\nS:U - The deadlock and the dangling parent pointer both stay inside kernel RFCOMM socket state and do not cross a virtualization or hardware boundary.\nC:H - A child enqueued after the drain keeps bt_sk(sk)->parent pointing at the listener, but bt_accept_enqueue takes no reference on it, so rfcomm_sock_kill frees the listener while the pointer is still live. A later state change then reads the freed sock through parent->sk_data_ready, a use-after-free that can be groomed for disclosure.\nI:H - On the peer's DISC, rfcomm_sk_state_change calls bt_accept_unlink(), which does list_del on the freed listener's accept_q and decrements its backlog, then makes an indirect call through the freed parent->sk_data_ready. That is a write to freed memory and a call through a function pointer an attacker can replace.\nA:H - The ABBA blocks krfcommd forever while it holds rfcomm_mutex (rfcomm_dlc_close in the closer against lock_sock(child) in rfcomm_sk_state_change). That stops all RFCOMM processing and hangs the closing task, and the use-after-free path can oops the kernel."
    }
  }
}