---
id: CVE-2026-53400
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  i2c: core: fix adapter registration race

  Adapters can be looked up based on their id using i2c_get_adapter()
  which takes a reference to the embedded struct device.

  Ma…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  i2c: core: fix adapter registration race

  Adapters can be looked up based on their id using i2c_get_adapter()
  which takes a reference to the embedded struct device.

  Ma…
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-362
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.22, < 5.10.261'
  - 'linux_kernel >= 5.11, < 5.15.212'
  - 'linux_kernel >= 5.16, < 6.1.178'
  - 'linux_kernel >= 6.2, < 6.6.145'
  - 'linux_kernel >= 6.7, < 6.12.95'
  - 'linux_kernel >= 6.13, < 6.18.38'
  - 'linux_kernel >= 6.19, < 7.1.3'
patched:
  - linux_kernel 7.1.3
published: '2026-07-19'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T09:18:16.267'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53400'
references:
  - url: 'https://git.kernel.org/stable/c/1febb174815bcae56d73587e99e8f87e02f0784d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2e57c788e71f1763445f812eba4e0b4a2fbd0646'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6a946038f2a5a8c29048c6af369d4e391448a5c5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/78793c75dc6d0ff2e4d50ad617349b328a99054e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a4365bc41baaf67f3a5aa8556d23544e6ec7480a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a4c8094bbf4c6fa68b17e3b16f6a0a1b7a14f3e0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ba14d7cf2fe7284610a29854bdff22b2537d3ce6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/da9d8d9711f78deebc202d0cffcf577e45ee8621'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00105
epssPercentile: 0.0097
ingestedAt: '2026-07-19T23:34:10.489Z'
---

## Overview

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

i2c: core: fix adapter registration race

Adapters can be looked up based on their id using i2c_get_adapter()
which takes a reference to the embedded struct device.

Make sure that the adapter (including its struct device) has been
initialised before adding it to the IDR to avoid accessing uninitialised
data which could, for example, lead to NULL-pointer dereferences or
use-after-free.

Note that the i2c-dev chardev, which is registered from a bus notifier,
currently uses i2c_get_adapter() so the adapter needs to be added to the
IDR before registration.

## Affected

- `linux_kernel >= 2.6.22, < 5.10.261`
- `linux_kernel >= 5.11, < 5.15.212`
- `linux_kernel >= 5.16, < 6.1.178`
- `linux_kernel >= 6.2, < 6.6.145`
- `linux_kernel >= 6.7, < 6.12.95`
- `linux_kernel >= 6.13, < 6.18.38`
- `linux_kernel >= 6.19, < 7.1.3`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.1.3`