---
id: CVE-2026-74530
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback

  There is theoretical UAF if the conn is freed while the hci_sync task is
  running.

  Hold refcount to a…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback

  There is theoretical UAF if the conn is freed while the hci_sync task is
  running.

  Hold refcount to a…
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'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 024421cf39923927ab2b5fe895d1d922b9abe67f <
    ff5625d27415ace5667bf87ebc16c3a0a98db22f
  - >-
    Linux >= 024421cf39923927ab2b5fe895d1d922b9abe67f <
    2d91e6244b69d752503b2d44020d8b0e323dbd38
  - >-
    Linux >= 024421cf39923927ab2b5fe895d1d922b9abe67f <
    56e78b670356caab0b607e8aad4cf819a1909d07
  - Linux 620810ac1f7f1133a9ac403e132b3ad6995ddf39
  - Linux ee0586ad64a805eaf1a9a10100e908627a561e34
  - Linux >= 6.12.28 < 6.13
  - Linux >= 6.14.6 < 6.15
  - Linux 6.15
published: '2026-08-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:17:47.013'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74530'
references:
  - url: 'https://git.kernel.org/stable/c/2d91e6244b69d752503b2d44020d8b0e323dbd38'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/56e78b670356caab0b607e8aad4cf819a1909d07'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ff5625d27415ace5667bf87ebc16c3a0a98db22f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.0034
epssPercentile: 0.25837
ingestedAt: '2026-10-15T11:00:41.676Z'
---

## Overview

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

Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback

There is theoretical UAF if the conn is freed while the hci_sync task is
running.

Hold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to
match the previous behavior.

## Remediation

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