---
id: CVE-2026-93189
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  HID: core: quiesce input in hid_hw_stop() to prevent use-after-free

  A driver's probe calls hid_device_io_start() to enable input delivery,
  then fails at a later initia…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  HID: core: quiesce input in hid_hw_stop() to prevent use-after-free

  A driver's probe calls hid_device_io_start() to enable input delivery,
  then fails at a later initia…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    0744cb9520aade37e78f69134f3111086158f1d2
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    c876c437d188911685d8bed645416f2e86bd0354
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    6787f1828f5616f17250e108c0031fb96fd2cfe6
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    92cca302a4eaf65d1b38b3fb600b4ee5eb856a51
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    02246d8b462fd9bd90bc7ae7d6cab1acf69bcb87
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    544ebb25bd58f67e821573412ab7a982b9e02211
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    0fecd89f979a8653b9a5b0816570329b7a94a081
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a4bc41504690b7d7064931909874f5b98cd148b6
  - Linux < 5.10.270
  - Linux < 5.15.221
  - Linux < 6.1.188
  - Linux < 6.6.157
  - Linux < 6.12.110
  - Linux < 6.18.52
  - Linux < 7.2.6
  - Linux (all versions)
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:18:24.110'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93189'
references:
  - url: 'https://git.kernel.org/stable/c/02246d8b462fd9bd90bc7ae7d6cab1acf69bcb87'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0744cb9520aade37e78f69134f3111086158f1d2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0fecd89f979a8653b9a5b0816570329b7a94a081'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/544ebb25bd58f67e821573412ab7a982b9e02211'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6787f1828f5616f17250e108c0031fb96fd2cfe6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/92cca302a4eaf65d1b38b3fb600b4ee5eb856a51'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a4bc41504690b7d7064931909874f5b98cd148b6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c876c437d188911685d8bed645416f2e86bd0354'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.004
epssPercentile: 0.31477
ingestedAt: '2026-09-17T16:21:47.725Z'
---

## Overview

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

HID: core: quiesce input in hid_hw_stop() to prevent use-after-free

A driver's probe calls hid_device_io_start() to enable input delivery,
then fails at a later initialization step and unwinds via hid_hw_stop().
The unwind frees struct hidraw via hidraw_disconnect() while in-flight
HID reports may still be running on another CPU, dereferencing the
freed object through hidraw_report_event(). syzbot reports the
resulting use-after-free for the corsair-psu HID driver.

Edward Adam Davis posted a per-driver fix for corsair-psu that adds
an explicit hid_device_io_stop() before hid_hw_stop() in the probe
error path ("hwmon: prevent packets from going to driver for probe",
2026-04-28). Auditing the tree shows 15 drivers call
hid_device_io_start(); 7 also call hid_device_io_stop() and 8 do not:

  drivers calling hid_device_io_start() without a matching
  hid_device_io_stop() before hid_hw_stop():
    drivers/hwmon/corsair-psu.c       (fix posted by Edward)
    drivers/hwmon/corsair-cpro.c
    drivers/hwmon/nzxt-kraken3.c
    drivers/hwmon/nzxt-smart2.c
    drivers/hwmon/gigabyte_waterforce.c
    drivers/hid/hid-logitech-dj.c
    drivers/hid/hid-nintendo.c
    drivers/hid/hid-mcp2221.c

Roughly half of all callers of the API are exposed. Centralize the
quiesce in hid_hw_stop() so callers do not have to remember the
matching stop: if a driver has left hdev->io_started true on entry,
call hid_device_io_stop() before hid_disconnect().

For the 7 drivers that already call hid_device_io_stop() correctly,
hdev->io_started is false on entry, the guard short-circuits, and
behavior is unchanged.

No Fixes: tag because the affected drivers gained their
hid_device_io_start() calls independently over years; the bug is a
class-wide API misuse rather than a regression from one commit.

## Remediation

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