---
id: CVE-2026-43022
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

  hci_cmd_sync_queue_once() needs to indicate whether a queue item was
  added, so caller can know …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

  hci_cmd_sync_queue_once() needs to indicate whether a queue item was
  added, so caller can know …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.9, < 6.19.12'
  - linux_kernel = 6.1.120
  - linux_kernel = 6.6.51
  - linux_kernel = 6.8.9
  - linux_kernel = 7.0
patched:
  - linux_kernel 6.19.12
published: '2026-05-01'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:17:29.830'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-43022'
references:
  - url: 'https://git.kernel.org/stable/c/0ad2ce230b38cd4b3f6732cc609e270461e626e5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2969554bcfccb5c609f6b6cd4a014933f3a66dd0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5cfa4f537a056c91ac6c09bc3ab58a4455217df7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00107
epssPercentile: 0.01099
ingestedAt: '2026-10-15T11:00:41.712Z'
---

## Overview

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

Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

hci_cmd_sync_queue_once() needs to indicate whether a queue item was
added, so caller can know if callbacks are called, so it can avoid
leaking resources.

Change the function to return -EEXIST if queue item already exists.

Modify all callsites to handle that.

## Affected

- `linux_kernel >= 6.9, < 6.19.12`
- `linux_kernel = 6.1.120`
- `linux_kernel = 6.6.51`
- `linux_kernel = 6.8.9`
- `linux_kernel = 7.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.12`