---
id: CVE-2026-43119
title: 'Bluetooth: hci_sync: annotate data-races around hdev->req_status'
summary: |-
  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;
  …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 <
    ff5855e8891e1e2490741366d087fd2fbcaabc4a
  - >-
    Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 <
    e51042ddc0b20d9bda5eb6dcf85a2668f9c5dae4
  - >-
    Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 <
    6e539907c0d11f514c5e0b049b27b04dff48a5b1
  - >-
    Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 <
    a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27
  - >-
    Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 <
    40734ce8efc34c4a0d0222855798c0dc14b65f2e
  - >-
    Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 <
    b6807cfc195ef99e1ac37b2e1e60df40295daa8c
  - Linux 8603d49906b231bbcd9141db7d096fa1041bc379
  - Linux 0e061885bfcd65ef5d09f154f3c3c3491cc7544a
  - Linux a3d50fb7ce931f08a2c6194fdc4c9a56c9ed4153
  - Linux >= 4.19.47 < 4.20
  - Linux >= 5.0.20 < 5.1
  - Linux >= 5.1.6 < 5.2
  - Linux 5.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:28:43.636559Z'
published: '2026-05-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:32:31.799Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43119'
references:
  - url: 'https://git.kernel.org/stable/c/ff5855e8891e1e2490741366d087fd2fbcaabc4a'
  - url: 'https://git.kernel.org/stable/c/e51042ddc0b20d9bda5eb6dcf85a2668f9c5dae4'
  - url: 'https://git.kernel.org/stable/c/6e539907c0d11f514c5e0b049b27b04dff48a5b1'
  - url: 'https://git.kernel.org/stable/c/a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27'
  - url: 'https://git.kernel.org/stable/c/40734ce8efc34c4a0d0222855798c0dc14b65f2e'
  - url: 'https://git.kernel.org/stable/c/b6807cfc195ef99e1ac37b2e1e60df40295daa8c'
tags:
  - cve.org
epss: 0.00114
epssPercentile: 0.015
ingestedAt: '2026-11-05T15:02:32.265Z'
---

## Overview

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).

## Affected

- `Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 < ff5855e8891e1e2490741366d087fd2fbcaabc4a`
- `Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 < e51042ddc0b20d9bda5eb6dcf85a2668f9c5dae4`
- `Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 < 6e539907c0d11f514c5e0b049b27b04dff48a5b1`
- `Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 < a7a1cdb4a64ca74eb95cc46648fccb8cd3f9af27`
- `Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 < 40734ce8efc34c4a0d0222855798c0dc14b65f2e`
- `Linux >= f80c5dad7b6467b884c445ffea45985793b4b2d0 < b6807cfc195ef99e1ac37b2e1e60df40295daa8c`
- `Linux 8603d49906b231bbcd9141db7d096fa1041bc379`
- `Linux 0e061885bfcd65ef5d09f154f3c3c3491cc7544a`
- `Linux a3d50fb7ce931f08a2c6194fdc4c9a56c9ed4153`
- `Linux >= 4.19.47 < 4.20`
- `Linux >= 5.0.20 < 5.1`
- `Linux >= 5.1.6 < 5.2`
- `Linux 5.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.