CVE-2026-64405 (GCVE-0-2026-64405)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:55
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6083089ab00631617f9eac678df3ab050a9d837a
Version: a13f316e90fdb1fb6df6582e845aa9b3270f3581
Version: a13f316e90fdb1fb6df6582e845aa9b3270f3581
Version: a13f316e90fdb1fb6df6582e845aa9b3270f3581
Version: a13f316e90fdb1fb6df6582e845aa9b3270f3581
Version: a13f316e90fdb1fb6df6582e845aa9b3270f3581
Version: e4511a67fcdba9729d1c7cfc6d2e645c765ce801
Version: 4ab81f16c68a602b2b69e333ae08d8748a9398de
Version: 6.1.83   ≤
Version: 6.4.16   ≤
Version: 6.5.3   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_conn.c",
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          ],
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          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_conn.c",
            "net/bluetooth/hci_sync.c"
          ],
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              "version": "7.2",
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "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-\u003esent_cmd) when a connection\nwas pending, but hdev-\u003esent_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-\u003esent_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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:55:03.466Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/903227b6168bb99fd57d4e3c9c1b5014986198e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/83b22d7f7c384564fa42c3cf19bec715c693d7a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/70c397b62ee015e19b3924d9da741c8dda017819"
        },
        {
          "url": "https://git.kernel.org/stable/c/61701912c58a05f6a043f097cc177a964abef348"
        },
        {
          "url": "https://git.kernel.org/stable/c/b42cb640a0493d16b61ddd267420274be15efdc1"
        },
        {
          "url": "https://git.kernel.org/stable/c/12917f591cea1af36087dba5b9ec888652f0b42a"
        }
      ],
      "title": "Bluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64405",
    "datePublished": "2026-07-25T08:50:47.262Z",
    "dateReserved": "2026-07-19T15:36:31.786Z",
    "dateUpdated": "2026-08-17T04:55:03.466Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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