---
id: CVE-2026-43018
title: 'Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt

  hci_conn lookup and field access must be covered by hdev lock in
  hci_le_remote_conn_param_r…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 95118dd4edfec950898a00180c6f998df0a6406d <
    59eecf0ffde15670e6a5e10c47be67f73d843b20
  - >-
    Linux >= 95118dd4edfec950898a00180c6f998df0a6406d <
    5fb69e1eeea9d6cba80517e9f058b56b34bc3a81
  - >-
    Linux >= 95118dd4edfec950898a00180c6f998df0a6406d <
    7cadb03be37e761130edb153544fe0770a842b19
  - >-
    Linux >= 95118dd4edfec950898a00180c6f998df0a6406d <
    1d0bdbfe3e91c11f0a704c52443a9446a10d699c
  - >-
    Linux >= 95118dd4edfec950898a00180c6f998df0a6406d <
    ea3cd36d7382d5f8309df04c275d20df139ed42c
  - >-
    Linux >= 95118dd4edfec950898a00180c6f998df0a6406d <
    b255531b27da336571411248c2a72a350662bd09
  - Linux 5.17
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:13:31.348841Z'
published: '2026-05-01'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:28.047Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43018'
references:
  - url: 'https://git.kernel.org/stable/c/59eecf0ffde15670e6a5e10c47be67f73d843b20'
  - url: 'https://git.kernel.org/stable/c/5fb69e1eeea9d6cba80517e9f058b56b34bc3a81'
  - url: 'https://git.kernel.org/stable/c/7cadb03be37e761130edb153544fe0770a842b19'
  - url: 'https://git.kernel.org/stable/c/1d0bdbfe3e91c11f0a704c52443a9446a10d699c'
  - url: 'https://git.kernel.org/stable/c/ea3cd36d7382d5f8309df04c275d20df139ed42c'
  - url: 'https://git.kernel.org/stable/c/b255531b27da336571411248c2a72a350662bd09'
tags:
  - cve.org
epss: 0.00403
epssPercentile: 0.32955
ingestedAt: '2026-10-16T17:24:46.676Z'
---

## Overview

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

Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt

hci_conn lookup and field access must be covered by hdev lock in
hci_le_remote_conn_param_req_evt, otherwise it's possible it is freed
concurrently.

Extend the hci_dev_lock critical section to cover all conn usage.

## Affected

- `Linux >= 95118dd4edfec950898a00180c6f998df0a6406d < 59eecf0ffde15670e6a5e10c47be67f73d843b20`
- `Linux >= 95118dd4edfec950898a00180c6f998df0a6406d < 5fb69e1eeea9d6cba80517e9f058b56b34bc3a81`
- `Linux >= 95118dd4edfec950898a00180c6f998df0a6406d < 7cadb03be37e761130edb153544fe0770a842b19`
- `Linux >= 95118dd4edfec950898a00180c6f998df0a6406d < 1d0bdbfe3e91c11f0a704c52443a9446a10d699c`
- `Linux >= 95118dd4edfec950898a00180c6f998df0a6406d < ea3cd36d7382d5f8309df04c275d20df139ed42c`
- `Linux >= 95118dd4edfec950898a00180c6f998df0a6406d < b255531b27da336571411248c2a72a350662bd09`
- `Linux 5.17`

## Remediation

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