---
id: CVE-2026-23178
title: 'HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()

  `i2c_hid_xfer` is used to read `recv_len + sizeof(__le16)` bytes of data
  into `ihid->rawbuf`.

  The …
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 <
    f9c9ad89d845f88a1509e9d672f65d234425fde9
  - >-
    Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 <
    cff3f619fd1cb40cdd89971df9001f075613d219
  - >-
    Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 <
    786ec171788bdf9dda38789163f1b1fbb47f2d1e
  - >-
    Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 <
    2124279f1f8c32c1646ce98e75a1a39b23b7db76
  - >-
    Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 <
    2497ff38c530b1af0df5130ca9f5ab22c5e92f29
  - Linux 5.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:06:40.043320Z'
published: '2026-02-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:09:50.041Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23178'
references:
  - url: 'https://git.kernel.org/stable/c/f9c9ad89d845f88a1509e9d672f65d234425fde9'
  - url: 'https://git.kernel.org/stable/c/cff3f619fd1cb40cdd89971df9001f075613d219'
  - url: 'https://git.kernel.org/stable/c/786ec171788bdf9dda38789163f1b1fbb47f2d1e'
  - url: 'https://git.kernel.org/stable/c/2124279f1f8c32c1646ce98e75a1a39b23b7db76'
  - url: 'https://git.kernel.org/stable/c/2497ff38c530b1af0df5130ca9f5ab22c5e92f29'
tags:
  - cve.org
epss: 0.00167
epssPercentile: 0.05555
ingestedAt: '2026-10-16T17:24:46.640Z'
---

## Overview

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

HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()

`i2c_hid_xfer` is used to read `recv_len + sizeof(__le16)` bytes of data
into `ihid->rawbuf`.

The former can come from the userspace in the hidraw driver and is only
bounded by HID_MAX_BUFFER_SIZE(16384) by default (unless we also set
`max_buffer_size` field of `struct hid_ll_driver` which we do not).

The latter has size determined at runtime by the maximum size of
different report types you could receive on any particular device and
can be a much smaller value.

Fix this by truncating `recv_len` to `ihid->bufsize - sizeof(__le16)`.

The impact is low since access to hidraw devices requires root.

## Affected

- `Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 < f9c9ad89d845f88a1509e9d672f65d234425fde9`
- `Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 < cff3f619fd1cb40cdd89971df9001f075613d219`
- `Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 < 786ec171788bdf9dda38789163f1b1fbb47f2d1e`
- `Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 < 2124279f1f8c32c1646ce98e75a1a39b23b7db76`
- `Linux >= 85df713377ddc0482071c3e6b64c37bd1e48f1f1 < 2497ff38c530b1af0df5130ca9f5ab22c5e92f29`
- `Linux 5.18`

## Remediation

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