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CVE-2022-50833

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

Description

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.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.

EPSS (exploitation in 30 days)
0.24% · top 85% of all CVEs (11 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected 3b382555706558f5c0587862b6dc03e96a252bba – < c4635cf3d845a7324c25c52d549b70c8bd7ad4c7
    • affected 877afadad2dce8aae1f2aad8ce47e072d4f6165e – < 3c6b036fe5c8ed8b6c4cbdc03605929882907ef0
    • affected 877afadad2dce8aae1f2aad8ce47e072d4f6165e – < deee93d13d385103205879a8a0915036ecd83261
    • affected 4bf367fa1fefabdf14938d0ac9ed60020389112e
    • affected 5.19.2 – < 5.19.15
    • affected 5.18.18 – < 5.19

  • Linux · Linux

    • affected 6.0
    • unaffected < 6.0
    • unaffected 5.19.15 – ≤ 5.19.*
    • unaffected 6.0.1 – ≤ 6.0.*
    • unaffected 6.1 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .