CVE-2026-97977 (GCVE-0-2026-97977)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btusb: Fix UAF of btusb_data by rx_work btusb_close() and btusb_flush() cancel data->rx_work with the asynchronous cancel_delayed_work(), so if btusb_rx_work() is already running on another CPU it keeps running after the cancel returns. btusb_disconnect() calls hci_unregister_dev(), which invokes btusb_close(), and then frees the btusb_data. A still running btusb_rx_work() then dereferences the freed data: while ((skb = skb_dequeue(&data->acl_q))) data->recv_acl(data->hdev, skb); Use cancel_delayed_work_sync() instead. In btusb_close() the cancel also has to happen after btusb_stop_traffic(), otherwise an URB completion racing with the cancel can requeue the work right after it has been waited for.
References
Impacted products
Vendor Product Version
Linux Linux Version: 800fe5ec302e1ebbf5e3f891f886deecd49c7132
Version: 800fe5ec302e1ebbf5e3f891f886deecd49c7132
Version: 800fe5ec302e1ebbf5e3f891f886deecd49c7132
Version: 800fe5ec302e1ebbf5e3f891f886deecd49c7132
Version: 800fe5ec302e1ebbf5e3f891f886deecd49c7132
Version: 800fe5ec302e1ebbf5e3f891f886deecd49c7132
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{
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          "programFiles": [
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btusb: Fix UAF of btusb_data by rx_work\n\nbtusb_close() and btusb_flush() cancel data-\u003erx_work with the\nasynchronous cancel_delayed_work(), so if btusb_rx_work() is already\nrunning on another CPU it keeps running after the cancel returns.\n\nbtusb_disconnect() calls hci_unregister_dev(), which invokes\nbtusb_close(), and then frees the btusb_data. A still running\nbtusb_rx_work() then dereferences the freed data:\n\n\twhile ((skb = skb_dequeue(\u0026data-\u003eacl_q)))\n\t\tdata-\u003erecv_acl(data-\u003ehdev, skb);\n\nUse cancel_delayed_work_sync() instead. In btusb_close() the cancel also\nhas to happen after btusb_stop_traffic(), otherwise an URB completion\nracing with the cancel can requeue the work right after it has been\nwaited for."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:11:44.507Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fc654a72a8d979db15e2773a481e931abaf5a9e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5242050195a711e9cd6a9935f689ab6656b94a91"
        },
        {
          "url": "https://git.kernel.org/stable/c/472d005622525b7be155cac99dde2252b0163bd1"
        },
        {
          "url": "https://git.kernel.org/stable/c/93b59937bda3fffc6386c79f5544a39bc680c8e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa391adb9c755515a89993634745e9079e5ef37c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c12c3117639e78940959d956519c758c57d0849"
        }
      ],
      "title": "Bluetooth: btusb: Fix UAF of btusb_data by rx_work",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97977",
    "datePublished": "2026-09-25T10:23:15.198Z",
    "dateReserved": "2026-09-25T10:18:58.208Z",
    "dateUpdated": "2026-10-19T09:11:44.507Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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