CVE-2026-64405

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: Fix null ptr deref in hci_abort_conn() hci_abort_conn() read hci_skb_event(hdev->sent_cmd) when a connection was pending, but hdev->sent_cmd can be NULL while req_status is still HCI_REQ_PEND, leading to a NULL pointer dereference and a general protection fault from the hci_rx_work() receive path. Instead of inspecting hdev->sent_cmd, track the in-flight create connection command with a new per-connection HCI_CONN_CREATE flag and route all cancellation through hci_cancel_connect_sync(), which dispatches to a dedicated per-type cancel function. The create command is in exactly one of two states: still queued, or in flight. The cancel function holds cmd_sync_work_lock across the whole decision: the worker takes this lock to dequeue every entry, so while it is held a queued command cannot start running and an in-flight command cannot complete and let the next command become pending. This keeps the flag test and hci_cmd_sync_cancel() atomic with respect to the worker, so a queued command is simply dequeued, and an in-flight command owned by this connection is cancelled without the risk of cancelling an unrelated command that became pending in the meantime. CIS uses the same flag mechanism via HCI_CONN_CREATE_CIS but cannot be dequeued per-connection. hci_acl_create_conn_sync() and hci_le_create_conn_sync() clear HCI_CONN_CREATE after the create command completes, but the command status handler can free conn via hci_conn_del() (for example when the controller rejects the connection) while the worker is still blocked on the connection complete event. Hold a reference on conn across the create command so the flag can be cleared without a use-after-free.

Severity

MEDIUM

CVSS score

5.5 (v3.1)

Vulnerability status

Analyzed

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-07-25 10:17:24.110000

Last modified

2026-11-06 17:18:53.503000

View original CVE JSON

{
  "id": "CVE-2026-64405",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-25T10:17:24.110",
  "lastModified": "2026-11-06T17:18:53.503",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()\n\nhci_abort_conn() read hci_skb_event(hdev->sent_cmd) when a connection\nwas pending, but hdev->sent_cmd can be NULL while req_status is still\nHCI_REQ_PEND, leading to a NULL pointer dereference and a general\nprotection fault from the hci_rx_work() receive path.\n\nInstead of inspecting hdev->sent_cmd, track the in-flight create\nconnection command with a new per-connection HCI_CONN_CREATE flag and\nroute all cancellation through hci_cancel_connect_sync(), which\ndispatches to a dedicated per-type cancel function. The create command\nis in exactly one of two states: still queued, or in flight. The cancel\nfunction holds cmd_sync_work_lock across the whole decision: the worker\ntakes this lock to dequeue every entry, so while it is held a queued\ncommand cannot start running and an in-flight command cannot complete\nand let the next command become pending. This keeps the flag test and\nhci_cmd_sync_cancel() atomic with respect to the worker, so a queued\ncommand is simply dequeued, and an in-flight command owned by this\nconnection is cancelled without the risk of cancelling an unrelated\ncommand that became pending in the meantime. CIS uses the same flag\nmechanism via HCI_CONN_CREATE_CIS but cannot be dequeued per-connection.\n\nhci_acl_create_conn_sync() and hci_le_create_conn_sync() clear\nHCI_CONN_CREATE after the create command completes, but the command\nstatus handler can free conn via hci_conn_del() (for example when the\ncontroller rejects the connection) while the worker is still blocked on\nthe connection complete event. Hold a reference on conn across the\ncreate command so the flag can be cleared without a use-after-free."
    }
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