---
id: CVE-2026-53251
title: 'Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync

  hci_get_route() returns a reference-counted hci_dev pointer via
  hci_dev_hold(). The function exit…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1360e5b6ce63d63d23223a659ca2bbafa30a53aa <
    4bbec25f47b930101294fd310c627c3f53e9661f
  - >-
    Linux >= 07a9342b94a91b306ed1cf6aa8254aea210764c9 <
    33d677d2e3713d98012c3dbd4a9207f7d785b854
  - >-
    Linux >= 07a9342b94a91b306ed1cf6aa8254aea210764c9 <
    23e8eb16820b866528fb300dc67fe3f67f00ef62
  - >-
    Linux >= 07a9342b94a91b306ed1cf6aa8254aea210764c9 <
    5cbf290b79351971f20c7a533247e8d58a3f970c
  - Linux bfec1e55314896bf4a4cfdb3a9ad4872be9f06ed
  - Linux >= 6.12.2 < 6.12.94
  - Linux >= 6.11.11 < 6.12
  - Linux 6.13
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:23:57.222634Z'
published: '2026-06-25'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:34:15.727Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53251'
references:
  - url: 'https://git.kernel.org/stable/c/4bbec25f47b930101294fd310c627c3f53e9661f'
  - url: 'https://git.kernel.org/stable/c/33d677d2e3713d98012c3dbd4a9207f7d785b854'
  - url: 'https://git.kernel.org/stable/c/23e8eb16820b866528fb300dc67fe3f67f00ef62'
  - url: 'https://git.kernel.org/stable/c/5cbf290b79351971f20c7a533247e8d58a3f970c'
tags:
  - cve.org
epss: 0.00122
epssPercentile: 0.01987
ingestedAt: '2026-11-06T16:57:43.261Z'
---

## Overview

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

Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync

hci_get_route() returns a reference-counted hci_dev pointer via
hci_dev_hold(). The function exits normally or with an error without ever
releasing it.

## Affected

- `Linux >= 1360e5b6ce63d63d23223a659ca2bbafa30a53aa < 4bbec25f47b930101294fd310c627c3f53e9661f`
- `Linux >= 07a9342b94a91b306ed1cf6aa8254aea210764c9 < 33d677d2e3713d98012c3dbd4a9207f7d785b854`
- `Linux >= 07a9342b94a91b306ed1cf6aa8254aea210764c9 < 23e8eb16820b866528fb300dc67fe3f67f00ef62`
- `Linux >= 07a9342b94a91b306ed1cf6aa8254aea210764c9 < 5cbf290b79351971f20c7a533247e8d58a3f970c`
- `Linux bfec1e55314896bf4a4cfdb3a9ad4872be9f06ed`
- `Linux >= 6.12.2 < 6.12.94`
- `Linux >= 6.11.11 < 6.12`
- `Linux 6.13`

## Remediation

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