UnratedFix available

Bluetooth: use hdev->workqueue when queuing hdev->{cmd,ncmd}_timer works

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.19.15, 6.0.1
CVEs: CVE-2022-50833
Confirmed fixed CVEs: Not specified
Updated in this feed: 28 Oct 2026, 08:56 UTC · Revision 1

Source evidence

Bluetooth: use hdev->workqueue when queuing hdev->{cmd,ncmd}_timer works

core-osv · Original source

Published 30 Dec 2025, 12:10 UTC

osv:CVE-2022-50833

Kernel

Fixed versions: 5.19.15, 6.0.1

Complete source record

{
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  "url": "https://osv.dev/vulnerability/CVE-2022-50833",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: use hdev->workqueue when queuing hdev->{cmd,ncmd}_timer works",
    "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.",
    "evidence": "osv:CVE-2022-50833",
    "products": [
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        "prerequisites": [],
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    "severity": "unknown",
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      "modified": "2026-10-08T02:47:50.647397302Z",
      "provider": "osv",
      "references": [
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  "source_id": "core-osv",
  "document_id": 98238,
  "published_at": "2025-12-30T12:10:54.342+00:00"
}