---
id: CVE-2026-64348
title: 'usb: free iso schedules on failed submit'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: free iso schedules on failed submit

  EHCI and FOTG210 isochronous submits build an ehci_iso_sched before
  linking the URB to the endpoint queue, and keep the staged…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 <
    b0d00d077f9738d215af9b50c74dffab7a1de19f
  - >-
    Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 <
    ab12316c4639237cc9d50c80a0c6240f11fbba3f
  - >-
    Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 <
    be5004395dfd0b6ec310db359f887fa396fd0dd2
  - >-
    Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 <
    8890699eea19027ef6e4f9cbcf27cba5e789793f
  - >-
    Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 <
    6bc17a78a05671d303820224fb37ca339c1dc2cb
  - >-
    Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 <
    4bb88aee6b868cbf73bf453f62497802f5fe4769
  - >-
    Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 <
    b9399d25fbb34a05bbe76eeedd730f62ff2670e9
  - Linux 2.6.15
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:36:27.229286Z'
published: '2026-07-25'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:44:48.289Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64348'
references:
  - url: 'https://git.kernel.org/stable/c/b0d00d077f9738d215af9b50c74dffab7a1de19f'
  - url: 'https://git.kernel.org/stable/c/ab12316c4639237cc9d50c80a0c6240f11fbba3f'
  - url: 'https://git.kernel.org/stable/c/be5004395dfd0b6ec310db359f887fa396fd0dd2'
  - url: 'https://git.kernel.org/stable/c/8890699eea19027ef6e4f9cbcf27cba5e789793f'
  - url: 'https://git.kernel.org/stable/c/6bc17a78a05671d303820224fb37ca339c1dc2cb'
  - url: 'https://git.kernel.org/stable/c/4bb88aee6b868cbf73bf453f62497802f5fe4769'
  - url: 'https://git.kernel.org/stable/c/b9399d25fbb34a05bbe76eeedd730f62ff2670e9'
tags:
  - cve.org
epss: 0.00129
epssPercentile: 0.02585
ingestedAt: '2026-11-05T15:02:32.419Z'
---

## Overview

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

usb: free iso schedules on failed submit

EHCI and FOTG210 isochronous submits build an ehci_iso_sched before
linking the URB to the endpoint queue, and keep the staged schedule in
urb->hcpriv until iso_stream_schedule() and the link helpers consume it.
If the controller is no longer accessible, or usb_hcd_link_urb_to_ep()
fails, submit jumps to done_not_linked before that handoff happens and
leaks the staged schedule still attached to urb->hcpriv.

Free the staged schedule from done_not_linked when submit fails before
the URB is linked and clear urb->hcpriv after the free.

The bug was first flagged by an experimental analysis tool we are
developing for kernel memory-management bugs while analyzing
v6.13-rc1. The tool is still under development and is not yet publicly
available. Manual inspection confirms that the bug is still
present in v7.1.1.

An x86_64 allyesconfig build showed no new warnings. As we do not have an
EHCI host controller with a USB isochronous device to test with, no
runtime testing was able to be performed.

## Affected

- `Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 < b0d00d077f9738d215af9b50c74dffab7a1de19f`
- `Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 < ab12316c4639237cc9d50c80a0c6240f11fbba3f`
- `Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 < be5004395dfd0b6ec310db359f887fa396fd0dd2`
- `Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 < 8890699eea19027ef6e4f9cbcf27cba5e789793f`
- `Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 < 6bc17a78a05671d303820224fb37ca339c1dc2cb`
- `Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 < 4bb88aee6b868cbf73bf453f62497802f5fe4769`
- `Linux >= 8de98402652c01839ae321be6cb3054cf5735d83 < b9399d25fbb34a05bbe76eeedd730f62ff2670e9`
- `Linux 2.6.15`

## Remediation

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