{
  "cveId": "CVE-2026-99011",
  "url": "https://patchblox.com/security/cve/CVE-2026-99011",
  "summary": "CVE-2026-99011 is fixed in linux on 1 platform by DEBIAN-CVE-2026-99011 (version 7.2.11-1), released October 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: SCO: serialise sco_conn lifetime agai...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: SCO: serialise sco_conn lifetime against sco_recv_scodata()  sco_recv_scodata() upgrades the weak hcon-\u003Esco_data back-pointer to a strong reference under hdev-\u003Elock:      hci_dev_lock(hdev);     hcon = hci_conn_hash_lookup_handle(hdev, handle);     ...     conn = sco_conn_hold_unless_zero(hcon-\u003Esco_data);     hci_dev_unlock(hdev);  but the pointer is cleared from the other side without that lock. When the last sco_conn reference is dropped, sco_conn_free() ran      conn-\u003Ehcon-\u003Esco_data = NULL;  with no hdev-\u003Elock held, so the RX path could read hcon-\u003Esco_data and call kref_get_unless_zero() on an sco_conn that was concurrently freed:      BUG: KASAN: slab-use-after-free in sco_conn_hold_unless_zero\u002B0xbe/0x160     Write of size 4 by task kworker/u17:0     Workqueue: hci0 hci_rx_work     Call Trace:      sco_conn_hold_unless_zero\u002B0xbe/0x160      sco_recv_scodata\u002B0x13f/0x490      hci_rx_work\u002B0x3af/0x730  kref_get_unless_zero() only guards against a zero refcount, not against the backing memory already being freed.  Give hcon-\u003Esco_data an actual reference on the sco_conn it points to, so the object cannot be freed while the pointer is still installed, and only clear and drop it from sco_conn_del(), which runs under hdev-\u003Elock (its callers, sco_connect_cfm() and sco_disconn_cfm(), hold it). The reader in sco_recv_scodata() also takes hdev-\u003Elock, so the store and the read are now serialised: the RX path either observes NULL or a reference that is guaranteed to stay valid until it drops its own.  sco_conn_add() no longer hands its kref_init() reference to the caller as the connection\u0027s only reference; that initial reference is the one owned by hcon-\u003Esco_data, and callers get their own via sco_conn_hold().  Because the sco_conn can now outlive the socket (the association keeps it alive until the link goes down), the hci_conn can no longer be dropped from sco_conn_free() without regressing socket close: closing a connected SCO socket must still tear the link down. Move hci_conn ownership to the socket instead: __sco_chan_add() takes an hci_conn reference and it is released from sco_chan_del() and sco_sock_destruct(), exactly once. The sco_conn no longer owns an hci_conn reference, so sco_conn_add() stops consuming one and sco_connect() drops the hci_connect_sco() reference on every path; sco_connect_cfm() no longer needs its hci_conn_hold() dance.",
  "published": "2026-10-23T13:17:23Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss": 0.00225,
  "epssPercentile": 0.13256,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.11-1",
      "fix": "DEBIAN-CVE-2026-99011",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99011",
      "released": "2026-10-24T13:25:57Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}