---
id: CVE-2026-98456
title: 'kernel: Bluetooth: mgmt: fix race in read_unconf_index_list() (CVE-2026-98456)'
summary: >-
  A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition
  in the read_unconf_index_list() function allows a local user to cause an
  out-of-bounds write during asynchronous controller setup. This issue occurs
  when device s…
severity: medium
cvss: 4.1
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T14:23:11+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98456.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98456.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98456'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554865'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98456'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98456'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98456.mbox
  - url: 'https://git.kernel.org/stable/c/524e0450dd9a396f99a81b045219b0e2ea0dab57'
  - url: 'https://git.kernel.org/stable/c/8ddf962c76432a10a6cb80042875cbc48a9c056b'
  - url: 'https://git.kernel.org/stable/c/416546cd6a54e9b68f2b91bc680b1ee17dcd77a1'
  - url: 'https://git.kernel.org/stable/c/2e8bba0360d1379bfa8da47c8f5dadbb10a3fba1'
  - url: 'https://git.kernel.org/stable/c/b5dbb41b212c50c095a4dbee3017a84fe94f033b'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00126
epssPercentile: 0.02265
scores:
  vendor: 4.1
  cna: 7
ingestedAt: '2026-10-18T15:45:12.303Z'
---

## Overview

A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition in the read_unconf_index_list() function allows a local user to cause an out-of-bounds write during asynchronous controller setup. This issue occurs when device state flags change between response buffer sizing and data population. A local attacker can exploit this vulnerability to cause memory corruption, resulting in a system crash and Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98456.json)

**kernel: Bluetooth: mgmt: fix race in read_unconf_index_list()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7

## Remediation

Fix deferred