---
id: CVE-2026-80826
title: 'USB: c67x00: fix use-after-free in c67x00_add_iso_urb()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  USB: c67x00: fix use-after-free in c67x00_add_iso_urb()

  When TD creation fails for the last packet of an isochronous URB,
  c67x00_add_iso_urb() gives the URB back befor…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    e4039e9bebb528dd9cd7ac72aeaec529c26c355a
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    ade18b4ce78a16558f4f435aece80082f6f7b64c
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    bb572801290e25ec1c4753d14af35777303f5d6b
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    62cd519ab74cac499036cd88c11692f8f0d53e14
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    ff172092cba7ec990ecc7b610ce703e19570b8f0
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    b4cb8081cf80f82e48fbe9c021a8f6d0fa2ed421
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    7983daa159981fac125db2457437723f38ea1472
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    f24dcc61bd0ecf7639fac5bf700450b398d793a7
  - >-
    Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d <
    b1e24de475bf2d66fffc9103f3444b783527d55a
  - Linux 2.6.26
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:44:18.781Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80826'
references:
  - url: 'https://git.kernel.org/stable/c/e4039e9bebb528dd9cd7ac72aeaec529c26c355a'
  - url: 'https://git.kernel.org/stable/c/ade18b4ce78a16558f4f435aece80082f6f7b64c'
  - url: 'https://git.kernel.org/stable/c/bb572801290e25ec1c4753d14af35777303f5d6b'
  - url: 'https://git.kernel.org/stable/c/62cd519ab74cac499036cd88c11692f8f0d53e14'
  - url: 'https://git.kernel.org/stable/c/ff172092cba7ec990ecc7b610ce703e19570b8f0'
  - url: 'https://git.kernel.org/stable/c/b4cb8081cf80f82e48fbe9c021a8f6d0fa2ed421'
  - url: 'https://git.kernel.org/stable/c/7983daa159981fac125db2457437723f38ea1472'
  - url: 'https://git.kernel.org/stable/c/f24dcc61bd0ecf7639fac5bf700450b398d793a7'
  - url: 'https://git.kernel.org/stable/c/b1e24de475bf2d66fffc9103f3444b783527d55a'
tags:
  - cve.org
epss: 0.00195
epssPercentile: 0.08588
ingestedAt: '2026-10-19T09:16:01.503Z'
---

## Overview

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

USB: c67x00: fix use-after-free in c67x00_add_iso_urb()

When TD creation fails for the last packet of an isochronous URB,
c67x00_add_iso_urb() gives the URB back before updating the endpoint
scheduling state.

c67x00_giveback_urb() frees the URB private data, and the completion
callback may release the final URB reference. The following accesses to
urbp->ep_data, urb->interval, and urbp->cnt can therefore use freed
memory.

Update next_frame and cnt before giving back the failed final packet,
making the giveback the last operation that uses the URB and its private
data.

## Affected

- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < e4039e9bebb528dd9cd7ac72aeaec529c26c355a`
- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < ade18b4ce78a16558f4f435aece80082f6f7b64c`
- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < bb572801290e25ec1c4753d14af35777303f5d6b`
- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < 62cd519ab74cac499036cd88c11692f8f0d53e14`
- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < ff172092cba7ec990ecc7b610ce703e19570b8f0`
- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < b4cb8081cf80f82e48fbe9c021a8f6d0fa2ed421`
- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < 7983daa159981fac125db2457437723f38ea1472`
- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < f24dcc61bd0ecf7639fac5bf700450b398d793a7`
- `Linux >= e9b29ffc519b9e63d4e1c0b1278bb951bb418a9d < b1e24de475bf2d66fffc9103f3444b783527d55a`
- `Linux 2.6.26`

## Remediation

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