{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90255",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90255"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "Bluetooth: hci_conn: fix the SCO setup context lifetime",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix the SCO setup context lifetime\n\nhci_setup_sync() queues a conn_handle_t with a NULL destroy callback, so\nthe context is only freed if hci_enhanced_setup_sync() actually runs. An\nentry that is cancelled instead is leaked, as\n_hci_cmd_sync_cancel_entry() does not release entry->data when there is\nno destroy callback, and hci_cmd_sync_clear() cancels every pending entry\nwhen the controller is unregistered.\n\nThe context also stores a bare hci_conn pointer, so the connection can be\nfreed while the work is queued. The dequeue in hci_conn_del() does not\ncover it either, as it matches on entry->data == conn and entry->data is\nthe wrapper here. Same problem as commit 2f5d635ad590 (\"Bluetooth:\nhci_sync: hold conn in hci_connect_acl/le_sync() callbacks\").\n\nHold the connection and release both from a destroy callback. The\nsubmission failure path drops both, since hci_cmd_sync_submit() does not\ncall the destroy callback when it fails to queue.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/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-2026-90255"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/37cfec41365c826d5496ef5d00c9e215eee53aa2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a661de0ee29d0915c5e924edf91d2be2b4d35bae"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c1fe3c74a89a7749cba3caa0dd91236049c66116"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4d7b1c834d2775b73c65e4888e01f5af8b477fe9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/42de40abe25db9211107af8896d0fd741f10648d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - hci_setup_sync() is reached from hci_sco_setup() on ACL HCI Connection Complete (hci_conn_complete_evt) and from hci_sync_conn_complete_evt retrying Enhanced Setup Synchronous Connection on remote error statuses (0x1a, 0x1c, 0x1e, 0x1f); those HCI events arrive over Bluetooth radio, scored Adjacent.\nAC:L - An attacker queues hci_enhanced_setup_sync via hci_setup_sync() (sco_connect->hci_connect_sco->hci_sco_setup, or Sync Conn Complete retries) then frees that SCO hci_conn with hci_conn_del (socket close, hci_disconn_complete_evt, or hci_setup_sync_conn_status). Dequeue matches entry->data==conn but data is the conn_handle_t wrapper, so both sides of the race are attacker-controlled.\nPR:N - A radio-adjacent peer needs no Linux account: HFP/PipeWire stacks cause the host to call hci_setup_sync, and the peer's Disconnection Complete or Synchronous Connection Complete events run hci_conn_del. Locally sco_sock_create() has no capability check (AF_BLUETOOTH is init_net only).\nUI:N - No extra victim action at exploit time: Bluetooth audio stacks automatically open outgoing SCO for a connected HFP/headset, and a local attacker uses their own BTPROTO_SCO sockets rather than inducing another user to mount or open a file.\nS:U - The use-after-free corrupts kernel heap (struct hci_conn) in the host Bluetooth stack and can escalate privileges in that same kernel authority; it does not cross a VM, guest-to-host, or IOMMU boundary.\nC:H - hci_enhanced_setup_sync() reads conn_handle->conn, kfree()s the wrapper, then uses conn (conn->codec, conn->parent, conn->attempt) after only a pointer-compare hci_conn_valid() check, so a freed or slab-reused hci_conn yields arbitrary kernel reads.\nI:H - The same callback writes conn->state, conn->out, and conn->attempt and builds HCI_OP_ENHANCED_SETUP_SYNC_CONN from freed codec fields; struct hci_conn has cleanup/connect_cfm_cb pointers, so slab reuse gives a kernel write and control-flow primitive.\nA:H - Dereferencing a freed hci_conn from hci_cmd_sync_work on req_workqueue causes a kernel oops or panic; UAF availability is High even without full exploitation. Cancelled cmd_sync entries also leak conn_handle_t because destroy was NULL."
    }
  }
}