---
id: CVE-2026-64128
title: 'Bluetooth: ISO: drop ISO_END frames received without prior ISO_START'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: ISO: drop ISO_END frames received without prior ISO_START

  ISO data PDUs carry a packet-boundary flag indicating START, CONT, END
  or SINGLE. The ISO_CONT bra…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a <
    1c3d1e1696b72579b970e17999c503a14535205b
  - >-
    Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a <
    3af41ee7ebecb0d5c8a504861f6cfad31345310f
  - >-
    Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a <
    39f4a82e80c8f5ed2d6952d73fbafc895721a728
  - >-
    Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a <
    61f2410a96dee808029e2ae4d6ef2dd635f3477f
  - >-
    Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a <
    e3a799881c12d27596232636a607e2e3fa448d63
  - >-
    Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a <
    84c24fb151fc1179355296d7ff29129ac7c42129
  - Linux 6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:30:23.419580Z'
published: '2026-07-19'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:34:26.719Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64128'
references:
  - url: 'https://git.kernel.org/stable/c/1c3d1e1696b72579b970e17999c503a14535205b'
  - url: 'https://git.kernel.org/stable/c/3af41ee7ebecb0d5c8a504861f6cfad31345310f'
  - url: 'https://git.kernel.org/stable/c/39f4a82e80c8f5ed2d6952d73fbafc895721a728'
  - url: 'https://git.kernel.org/stable/c/61f2410a96dee808029e2ae4d6ef2dd635f3477f'
  - url: 'https://git.kernel.org/stable/c/e3a799881c12d27596232636a607e2e3fa448d63'
  - url: 'https://git.kernel.org/stable/c/84c24fb151fc1179355296d7ff29129ac7c42129'
tags:
  - cve.org
epss: 0.00128
epssPercentile: 0.02471
ingestedAt: '2026-11-06T16:57:43.232Z'
---

## Overview

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

Bluetooth: ISO: drop ISO_END frames received without prior ISO_START

ISO data PDUs carry a packet-boundary flag indicating START, CONT, END
or SINGLE. The ISO_CONT branch of iso_recv() guards against a missing
ISO_START by checking conn->rx_len before touching conn->rx_skb, but
ISO_END does not.

If a peer sends an ISO_END as the first packet on a fresh ISO
connection, conn->rx_skb is still NULL and conn->rx_len is zero, so
skb_put(conn->rx_skb, ...) dereferences NULL and oopses. For BIS,
where receivers sync to a broadcaster without pairing, any broadcaster
on the air can trigger this.

Mirror the ISO_CONT check at the top of ISO_END so a stray end fragment
is logged and dropped instead of crashing the host.

## Affected

- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 1c3d1e1696b72579b970e17999c503a14535205b`
- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 3af41ee7ebecb0d5c8a504861f6cfad31345310f`
- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 39f4a82e80c8f5ed2d6952d73fbafc895721a728`
- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 61f2410a96dee808029e2ae4d6ef2dd635f3477f`
- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < e3a799881c12d27596232636a607e2e3fa448d63`
- `Linux >= ccf74f2390d60a2f9a75ef496d2564abb478f46a < 84c24fb151fc1179355296d7ff29129ac7c42129`
- `Linux 6.0`

## Remediation

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