---
id: CVE-2025-37813
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: xhci: Fix invalid pointer dereference in Etron workaround

  This check is performed before prepare_transfer() and prepare_ring(), so
  enqueue can already point at th…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: xhci: Fix invalid pointer dereference in Etron workaround

  This check is performed before prepare_transfer() and prepare_ring(), so
  enqueue can already point at th…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.6.66, < 6.6.89'
  - 'linux_kernel >= 6.11.11, < 6.12'
  - 'linux_kernel >= 6.12.2, < 6.12.26'
  - 'linux_kernel >= 6.13, < 6.14.5'
  - linux_kernel = 6.15
patched:
  - linux_kernel 6.14.5
published: '2025-05-08'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:18:18.577'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-37813'
references:
  - url: 'https://git.kernel.org/stable/c/0624e29c595b05e7a0e6d1c368f0a05799928e30'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/142273a49f2c315eabdbdf5a71c15e479b75ca91'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1ea050da5562af9b930d17cbbe9632d30f5df43a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bce3055b08e303e28a8751f6073066f5c33a0744'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.002
epssPercentile: 0.09697
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:45:20.958093Z'
ingestedAt: '2026-10-15T22:48:25.479Z'
---

## Overview

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

usb: xhci: Fix invalid pointer dereference in Etron workaround

This check is performed before prepare_transfer() and prepare_ring(), so
enqueue can already point at the final link TRB of a segment. And indeed
it will, some 0.4% of times this code is called.

Then enqueue + 1 is an invalid pointer. It will crash the kernel right
away or load some junk which may look like a link TRB and cause the real
link TRB to be replaced with a NOOP. This wouldn't end well.

Use a functionally equivalent test which doesn't dereference the pointer
and always gives correct result.

Something has crashed my machine twice in recent days while playing with
an Etron HC, and a control transfer stress test ran for confirmation has
just crashed it again. The same test passes with this patch applied.

## Affected

- `linux_kernel >= 6.6.66, < 6.6.89`
- `linux_kernel >= 6.11.11, < 6.12`
- `linux_kernel >= 6.12.2, < 6.12.26`
- `linux_kernel >= 6.13, < 6.14.5`
- `linux_kernel = 6.15`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.14.5`