---
id: CVE-2026-80931
title: >-
  kernel: w1: ds28e17: reject an oversize length on an I2C block read
  (CVE-2026-80931)
summary: >-
  A flaw was found in the Linux kernel's w1: ds28e17 1-Wire to I2C bridge
  driver. A malicious I2C slave device can provide an oversized length during an
  I2C block read operation. This causes the driver to read beyond the allocated
  buffer, le…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-125
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <
    b30c021c6073559ea6851b522d8a17a524a27b4a
  - >-
    Linux >= ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <
    1d08877fc37e90945df38d255715bd1d6c052d46
  - >-
    Linux >= ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <
    bf76d61e118b7044600a65775a3bf8adc2c6823d
  - >-
    Linux >= ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <
    0f6496b34cc2919420f303b2aabdd9f71e084b56
  - >-
    Linux >= ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <
    cb55c5da9828f77db2a2701316949d4de1e9b773
  - >-
    Linux >= ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <
    ae0c79a8527044e54d81fd5a3b49ce6177633758
  - >-
    Linux >= ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <
    6df05f630c84a109736642362e452089886f9974
  - >-
    Linux >= ebc4768ac4971eab4b570e733e47ac9dfd0e4175 <
    169ae5e65e5aaf213b6a578f6478a9fd2e523606
  - Linux 4.15
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T14:48:08+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80931.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80931.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80931'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532277'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80931'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80931'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80931.mbox
  - url: 'https://git.kernel.org/stable/c/b30c021c6073559ea6851b522d8a17a524a27b4a'
  - url: 'https://git.kernel.org/stable/c/1d08877fc37e90945df38d255715bd1d6c052d46'
  - url: 'https://git.kernel.org/stable/c/bf76d61e118b7044600a65775a3bf8adc2c6823d'
  - url: 'https://git.kernel.org/stable/c/0f6496b34cc2919420f303b2aabdd9f71e084b56'
  - url: 'https://git.kernel.org/stable/c/cb55c5da9828f77db2a2701316949d4de1e9b773'
  - url: 'https://git.kernel.org/stable/c/ae0c79a8527044e54d81fd5a3b49ce6177633758'
  - url: 'https://git.kernel.org/stable/c/6df05f630c84a109736642362e452089886f9974'
  - url: 'https://git.kernel.org/stable/c/169ae5e65e5aaf213b6a578f6478a9fd2e523606'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00129
epssPercentile: 0.02906
scores:
  vendor: 5.5
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.455Z'
---

## Overview

A flaw was found in the Linux kernel's w1: ds28e17 1-Wire to I2C bridge driver. A malicious I2C slave device can provide an oversized length during an I2C block read operation. This causes the driver to read beyond the allocated buffer, leading to an out-of-bounds read of up to 222 bytes. This vulnerability could allow a local attacker to disclose sensitive information or cause a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80931.json)

**kernel: w1: ds28e17: reject an oversize length on an I2C block read** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.