---
id: CVE-2026-80819
title: >-
  kernel: Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept
  (CVE-2026-80819)
summary: >-
  A flaw was found in the Bluetooth RFCOMM (Radio Frequency Communication)
  subsystem of the Linux kernel. A remote attacker can send a specially crafted
  Bluetooth Disconnect (DISC) message to a device with a deferred RFCOMM
  channel. This can…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-476
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-04'
updated: '2026-10-25'
sourceUpdated: '2026-10-25T23:14:19+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80819.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80819.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80819'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2528593'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80819'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80819'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80819.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-80819'
  - url: 'https://git.kernel.org/stable/c/d8d686dd5662a7c4745e4515f1237a9f3b7df181'
  - url: 'https://git.kernel.org/stable/c/eb71d5a1ea8ff2683e394b48ae3cd676037ab4c2'
  - url: 'https://git.kernel.org/stable/c/56f0aa75c7640e46397ef73bea251fcbef9150c0'
  - url: 'https://git.kernel.org/stable/c/362726c9c6e56eea4262109183e49868c39ccd3a'
  - url: 'https://git.kernel.org/stable/c/825b95561d7b7c393df9e7bc295451aaeadc3d18'
  - url: 'https://git.kernel.org/stable/c/d4b1a13b1eff2e80925c7368ffdeaaa50cba93df'
  - url: 'https://git.kernel.org/stable/c/355bfd57ca4ca881c6eb03ca813b440a094b1f44'
  - url: 'https://git.kernel.org/stable/c/b405c2f96ae2e37375105881890f7738833b1d62'
  - url: 'https://git.kernel.org/stable/c/43a556b2fd43f2df6dded59c2e26560a27874c24'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00195
epssPercentile: 0.09132
ingestedAt: '2026-10-19T09:16:01.505Z'
---

## Overview

A flaw was found in the Bluetooth RFCOMM (Radio Frequency Communication) subsystem of the Linux kernel. A remote attacker can send a specially crafted Bluetooth Disconnect (DISC) message to a device with a deferred RFCOMM channel. This can lead to a null pointer dereference when the system attempts to process the message, resulting in a kernel crash and a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, 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 7, Red Hat Enterprise Linux 8, … · updated 2026-10-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80819.json)

**kernel: Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept** — rated Moderate by Red Hat. Released 2026-09-04, updated 2026-10-25.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- 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 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope

Workarounds / mitigations:

- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.