---
id: CVE-2026-89739
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to
  race condition


  In dwc3_gadget_init_endpoint, &dep->nostream_work is bound with

  dwc3_nostream…
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to
  race condition


  In dwc3_gadget_init_endpoint, &dep->nostream_work is bound with

  dwc3_nostream…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-825
  - CWE-416
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f41ffcd656615754741f190afca00ca3c4bde9f1 <
    5f359265f616873edf32db418bd1513fdae3ddec
  - >-
    Linux >= dcfe437492e27d54f3ac491aed024da760f5c43c <
    448e95c0f3eaa8d99f16ccae92ab94545f14413b
  - >-
    Linux >= dcfe437492e27d54f3ac491aed024da760f5c43c <
    93e08b13a7a30e4e78556d993720e0bc36231ec7
  - >-
    Linux >= dcfe437492e27d54f3ac491aed024da760f5c43c <
    9c855832790cd488d87de1885974f4c37cfe7358
  - Linux 6.14
published: '2026-09-11'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:43.010'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89739'
references:
  - url: 'https://git.kernel.org/stable/c/448e95c0f3eaa8d99f16ccae92ab94545f14413b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5f359265f616873edf32db418bd1513fdae3ddec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/93e08b13a7a30e4e78556d993720e0bc36231ec7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9c855832790cd488d87de1885974f4c37cfe7358'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89739.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89739'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532363'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89739'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89739'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89739.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-89739'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00209
epssPercentile: 0.10951
cvssSource: vendor
ingestedAt: '2026-09-14T11:11:19.885Z'
---

## Overview

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

usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition

In dwc3_gadget_init_endpoint, &dep->nostream_work is bound with
dwc3_nostream_work, and dwc3_gadget_endpoint_stream_event can queue
this delayed work on system_percpu_wq when a DEPEVT_STREAM_NOSTREAM
event is received.

If we remove the gadget, dwc3_gadget_free_endpoints makes cleanup and
the memory allocated for dep with kzalloc() is released by kfree(dep),
while the delayed work mentioned above may still be pending or
running. The sequence of operations that may lead to a UAF bug is as
follows:

CPU0                                      CPU1

                                          | dwc3_thread_interrupt
                                          | dwc3_endpoint_interrupt
                                          | dwc3_gadget_endpoint_stream_event
                                          | queue_delayed_work(system_percpu_wq,
                                          |                    &dep->nostream_work)
dwc3_gadget_free_endpoints                |
dwc3_free_trb_pool(dep)                   |
list_del(&dep->endpoint.ep_list)          |
dwc3_debugfs_remove_endpoint_dir(dep)     |
kfree(dep)                                |
// dep is freed                           |
                                          | dwc3_nostream_work
                                          | // use dep (use-after-free)

Fix it by canceling the delayed work before kfree(dep) in
dwc3_gadget_free_endpoints.

## 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, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89739.json)