---
id: CVE-2026-63916
title: 'HID: wacom: Fix OOB write in wacom_hid_set_device_mode()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  HID: wacom: Fix OOB write in wacom_hid_set_device_mode()

  wacom_hid_set_device_mode() currently assumes that the HID_DG_INPUTMODE
  usage is always located in the first f…
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 <
    2add311d99646c9d235b2c44f9c169ba30f5db3a
  - >-
    Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 <
    83bd8a5756a3c4a413ed8f6253f9eb2821e1ccaf
  - >-
    Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 <
    5716a293fb19d382ca2336e08fd28a619a5f3c25
  - >-
    Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 <
    ed598de9f61582902406d352d99f2073d8e00298
  - >-
    Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 <
    43e7c02d6090a82fd60d63491f6871aec906345e
  - >-
    Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 <
    b8338111e14183972359009c12d0dbd81d2e1e16
  - >-
    Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 <
    5db3fca0cec7b33bc5379411d0a60d792c9f9bc0
  - >-
    Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 <
    c0a8899e02ddebd51e2589835182c239c2e224ae
  - Linux 3.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:33:16.082526Z'
published: '2026-07-19'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:42:11.259Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-63916'
references:
  - url: 'https://git.kernel.org/stable/c/2add311d99646c9d235b2c44f9c169ba30f5db3a'
  - url: 'https://git.kernel.org/stable/c/83bd8a5756a3c4a413ed8f6253f9eb2821e1ccaf'
  - url: 'https://git.kernel.org/stable/c/5716a293fb19d382ca2336e08fd28a619a5f3c25'
  - url: 'https://git.kernel.org/stable/c/ed598de9f61582902406d352d99f2073d8e00298'
  - url: 'https://git.kernel.org/stable/c/43e7c02d6090a82fd60d63491f6871aec906345e'
  - url: 'https://git.kernel.org/stable/c/b8338111e14183972359009c12d0dbd81d2e1e16'
  - url: 'https://git.kernel.org/stable/c/5db3fca0cec7b33bc5379411d0a60d792c9f9bc0'
  - url: 'https://git.kernel.org/stable/c/c0a8899e02ddebd51e2589835182c239c2e224ae'
tags:
  - cve.org
epss: 0.00354
epssPercentile: 0.27561
ingestedAt: '2026-10-16T17:24:46.775Z'
---

## Overview

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

HID: wacom: Fix OOB write in wacom_hid_set_device_mode()

wacom_hid_set_device_mode() currently assumes that the HID_DG_INPUTMODE
usage is always located in the first field (field[0]) of the feature report.
However, a device can specify HID_DG_INPUTMODE in a different field.

If HID_DG_INPUTMODE is in a field other than the first one and the first
field has a report_count smaller than the usage_index of HID_DG_INPUTMODE,
this leads to an out-of-bounds write to r->field[0]->value.

Fix this by storing the field index of HID_DG_INPUTMODE in 'struct
hid_data' during feature mapping.  In wacom_hid_set_device_mode(), use
this stored field index to access the correct field and add bounds
checks to ensure both the field index and the value index are within
valid ranges before writing.

## Affected

- `Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 < 2add311d99646c9d235b2c44f9c169ba30f5db3a`
- `Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 < 83bd8a5756a3c4a413ed8f6253f9eb2821e1ccaf`
- `Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 < 5716a293fb19d382ca2336e08fd28a619a5f3c25`
- `Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 < ed598de9f61582902406d352d99f2073d8e00298`
- `Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 < 43e7c02d6090a82fd60d63491f6871aec906345e`
- `Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 < b8338111e14183972359009c12d0dbd81d2e1e16`
- `Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 < 5db3fca0cec7b33bc5379411d0a60d792c9f9bc0`
- `Linux >= 5ae6e89f7409cb5d218bb728326eba9c650d9700 < c0a8899e02ddebd51e2589835182c239c2e224ae`
- `Linux 3.18`

## Remediation

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