---
id: CVE-2026-80721
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: ISO: ensure no dangling hcon references in iso_conn

  After iso_conn_del(), ISO sockets should not dereference the hcon any
  more
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: ISO: ensure no dangling hcon references in iso_conn

  After iso_conn_del(), ISO sockets should not dereference the hcon any
  more.  Currently, clearing iso_con…
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'
cwe:
  - CWE-911
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= dc26097bdb864a0d5955b9a25e43376ffc1af99b <
    e941799c31f68e67ce0976efb38a79101f921b64
  - >-
    Linux >= dc26097bdb864a0d5955b9a25e43376ffc1af99b <
    cdce8af9291d8a1f8916c271de029bf558d9e8ec
  - >-
    Linux >= dc26097bdb864a0d5955b9a25e43376ffc1af99b <
    aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb
  - Linux f53e7489273dc2bb307bf50f319b3762d45534f0
  - Linux a58d0f5dac322e16cc75334d000666512341bde5
  - Linux >= 6.11.11 < 6.12
  - Linux >= 6.12.2 < 6.13
  - Linux 6.13
published: '2026-08-28'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:18:08.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80721'
references:
  - url: 'https://git.kernel.org/stable/c/aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cdce8af9291d8a1f8916c271de029bf558d9e8ec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e941799c31f68e67ce0976efb38a79101f921b64'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80721.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80721'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2525453'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80721'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80721'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026082811-CVE-2026-80721-72a6@gregkh/T
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00375
epssPercentile: 0.31297
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:20:54.409613Z'
scores:
  nvd: 8.8
  vendor: 5.5
ingestedAt: '2026-08-30T07:49:06.270Z'
---

## Overview

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

Bluetooth: ISO: ensure no dangling hcon references in iso_conn

After iso_conn_del(), ISO sockets should not dereference the hcon any
more.  Currently, clearing iso_conn::hcon relies on iso_conn_del()
releasing the last reference to the iso_conn.

Simplify this by explicitly clearing conn->hcon in iso_conn_del(), to
avoid more complex reasoning on races about who holds the last
reference.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80721.json)