---
id: CVE-2026-98736
title: >-
  kernel: Bluetooth: hci_conn: Lock parent access during enhanced SCO setup
  (CVE-2026-98736)
summary: >-
  A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition
  occurs during enhanced Synchronous Connection-Oriented (SCO) link setup due to
  missing locking when accessing parent connection structures. A local user or
  adjace…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-825
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T01:35:32+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98736.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98736.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98736'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555090'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98736'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98736'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98736.mbox
  - url: 'https://git.kernel.org/stable/c/70b55855eecb428d446344d827bda8725ce8b312'
  - url: 'https://git.kernel.org/stable/c/1239ef0fa809b5952fca679db3faa3e1c00e1dac'
  - url: 'https://git.kernel.org/stable/c/cabd58d9bb66d49d481f762ce986173db397435d'
  - url: 'https://git.kernel.org/stable/c/93a737e4e042f59673cd580d35214f278d7b757d'
  - url: 'https://git.kernel.org/stable/c/024e05f73a4c1263d031614bc36700ec135eecb4'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00168
epssPercentile: 0.05968
ingestedAt: '2026-10-18T16:47:32.504Z'
---

## Overview

A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition occurs during enhanced Synchronous Connection-Oriented (SCO) link setup due to missing locking when accessing parent connection structures. A local user or adjacent attacker could exploit this timing window by concurrently disconnecting the link, causing a use-after-free condition. This flaw could lead to a Denial of Service (DoS) via a system crash or potentially arbitrary code execution.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98736.json)

**kernel: Bluetooth: hci_conn: Lock parent access during enhanced SCO setup** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope