FKIE_CVE-2022-50833

Vulnerability from fkie_nvd - Published: 2025-12-30 13:15 - Updated: 2025-12-31 20:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: use hdev->workqueue when queuing hdev->{cmd,ncmd}_timer works syzbot is reporting attempt to schedule hdev->cmd_work work from system_wq WQ into hdev->workqueue WQ which is under draining operation [1], for commit c8efcc2589464ac7 ("workqueue: allow chained queueing during destruction") does not allow such operation. The check introduced by commit 877afadad2dce8aa ("Bluetooth: When HCI work queue is drained, only queue chained work") was incomplete. Use hdev->workqueue WQ when queuing hdev->{cmd,ncmd}_timer works because hci_{cmd,ncmd}_timeout() calls queue_work(hdev->workqueue). Also, protect the queuing operation with RCU read lock in order to avoid calling queue_delayed_work() after cancel_delayed_work() completed.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c6b036fe5c8ed8b6c4cbdc03605929882907ef0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c4635cf3d845a7324c25c52d549b70c8bd7ad4c7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/deee93d13d385103205879a8a0915036ecd83261
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: use hdev-\u003eworkqueue when queuing hdev-\u003e{cmd,ncmd}_timer works\n\nsyzbot is reporting attempt to schedule hdev-\u003ecmd_work work from system_wq\nWQ into hdev-\u003eworkqueue WQ which is under draining operation [1], for\ncommit c8efcc2589464ac7 (\"workqueue: allow chained queueing during\ndestruction\") does not allow such operation.\n\nThe check introduced by commit 877afadad2dce8aa (\"Bluetooth: When HCI work\nqueue is drained, only queue chained work\") was incomplete.\n\nUse hdev-\u003eworkqueue WQ when queuing hdev-\u003e{cmd,ncmd}_timer works because\nhci_{cmd,ncmd}_timeout() calls queue_work(hdev-\u003eworkqueue). Also, protect\nthe queuing operation with RCU read lock in order to avoid calling\nqueue_delayed_work() after cancel_delayed_work() completed."
    }
  ],
  "id": "CVE-2022-50833",
  "lastModified": "2025-12-31T20:43:05.160",
  "metrics": {},
  "published": "2025-12-30T13:15:57.810",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3c6b036fe5c8ed8b6c4cbdc03605929882907ef0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c4635cf3d845a7324c25c52d549b70c8bd7ad4c7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/deee93d13d385103205879a8a0915036ecd83261"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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