CVE-2022-50339 (GCVE-0-2022-50339)
Vulnerability from cvelistv5
Published
2025-09-16 16:11
Modified
2025-09-16 16:11
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev() syzbot is again reporting attempt to cancel uninitialized work at mgmt_index_removed() [1], for setting of HCI_MGMT flag from mgmt_init_hdev() from hci_mgmt_cmd() from hci_sock_sendmsg() can race with testing of HCI_MGMT flag from mgmt_index_removed() from hci_sock_bind() due to lack of serialization via hci_dev_lock(). Since mgmt_init_hdev() is called with mgmt_chan_list_lock held, we can safely split hci_dev_test_and_set_flag() into hci_dev_test_flag() and hci_dev_set_flag(). Thus, in order to close this race, set HCI_MGMT flag after INIT_DELAYED_WORK() completed. This is a local fix based on mgmt_chan_list_lock. Lack of serialization via hci_dev_lock() might be causing different race conditions somewhere else. But a global fix based on hci_dev_lock() should deserve a future patch.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e53c6180db8dd09de94e0a3bdf4fef6f5f9dd6e6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f74ca25d6d6629ffd4fd80a1a73037253b57d06b
Impacted products
Vendor Product Version
Linux Linux Version: 3f2893d3c142986aa935821460cb3adb77044722
Version: 3f2893d3c142986aa935821460cb3adb77044722
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   Linux Linux Version: 6.0
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "net/bluetooth/mgmt.c"
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      "descriptions": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev()\n\nsyzbot is again reporting attempt to cancel uninitialized work\nat mgmt_index_removed() [1], for setting of HCI_MGMT flag from\nmgmt_init_hdev() from hci_mgmt_cmd() from hci_sock_sendmsg() can\nrace with testing of HCI_MGMT flag from mgmt_index_removed() from\nhci_sock_bind() due to lack of serialization via hci_dev_lock().\n\nSince mgmt_init_hdev() is called with mgmt_chan_list_lock held, we can\nsafely split hci_dev_test_and_set_flag() into hci_dev_test_flag() and\nhci_dev_set_flag(). Thus, in order to close this race, set HCI_MGMT flag\nafter INIT_DELAYED_WORK() completed.\n\nThis is a local fix based on mgmt_chan_list_lock. Lack of serialization\nvia hci_dev_lock() might be causing different race conditions somewhere\nelse. But a global fix based on hci_dev_lock() should deserve a future\npatch."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-09-16T16:11:30.176Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/f74ca25d6d6629ffd4fd80a1a73037253b57d06b"
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      ],
      "title": "Bluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev()",
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    "cveId": "CVE-2022-50339",
    "datePublished": "2025-09-16T16:11:19.138Z",
    "dateReserved": "2025-09-16T16:03:27.881Z",
    "dateUpdated": "2025-09-16T16:11:30.176Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50339\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T17:15:32.647\",\"lastModified\":\"2025-09-17T14:18:55.093\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev()\\n\\nsyzbot is again reporting attempt to cancel uninitialized work\\nat mgmt_index_removed() [1], for setting of HCI_MGMT flag from\\nmgmt_init_hdev() from hci_mgmt_cmd() from hci_sock_sendmsg() can\\nrace with testing of HCI_MGMT flag from mgmt_index_removed() from\\nhci_sock_bind() due to lack of serialization via hci_dev_lock().\\n\\nSince mgmt_init_hdev() is called with mgmt_chan_list_lock held, we can\\nsafely split hci_dev_test_and_set_flag() into hci_dev_test_flag() and\\nhci_dev_set_flag(). Thus, in order to close this race, set HCI_MGMT flag\\nafter INIT_DELAYED_WORK() completed.\\n\\nThis is a local fix based on mgmt_chan_list_lock. Lack of serialization\\nvia hci_dev_lock() might be causing different race conditions somewhere\\nelse. But a global fix based on hci_dev_lock() should deserve a future\\npatch.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/e53c6180db8dd09de94e0a3bdf4fef6f5f9dd6e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f74ca25d6d6629ffd4fd80a1a73037253b57d06b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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