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Medium severity5.5NVD Advisory· Published May 6, 2026· Updated Jul 24, 2026

CVE-2026-43119

CVE-2026-43119

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: annotate data-races around hdev->req_status

__hci_cmd_sync_sk() sets hdev->req_status under hdev->req_lock:

hdev->req_status = HCI_REQ_PEND;

However, several other functions read or write hdev->req_status without holding any lock:

  • hci_send_cmd_sync() reads req_status in hci_cmd_work (workqueue)
  • hci_cmd_sync_complete() reads/writes from HCI event completion
  • hci_cmd_sync_cancel() / hci_cmd_sync_cancel_sync() read/write
  • hci_abort_conn() reads in connection abort path

Since __hci_cmd_sync_sk() runs on hdev->req_workqueue while hci_send_cmd_sync() runs on hdev->workqueue, these are different workqueues that can execute concurrently on different CPUs. The plain C accesses constitute a data race.

Add READ_ONCE()/WRITE_ONCE() annotations on all concurrent accesses to hdev->req_status to prevent potential compiler optimizations that could affect correctness (e.g., load fusing in the wait_event condition or store reordering).

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Affected products

27

Patches

Vulnerability mechanics

References

5

News mentions

1