---
id: CVE-2026-31752
title: 'bridge: br_nd_send: validate ND option lengths'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bridge: br_nd_send: validate ND option lengths

  br_nd_send() walks ND options according to option-provided lengths.
  A malformed option can make the parser advance beyon…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ed842faeb2bd49256f00485402f3113205f91d30 <
    82a42eceec7c6bdb0e0da94c0542a173b7ea57f2
  - >-
    Linux >= ed842faeb2bd49256f00485402f3113205f91d30 <
    259466f76f5a2148aff11134e68f4b4c6d52725b
  - >-
    Linux >= ed842faeb2bd49256f00485402f3113205f91d30 <
    ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a
  - >-
    Linux >= ed842faeb2bd49256f00485402f3113205f91d30 <
    e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa
  - >-
    Linux >= ed842faeb2bd49256f00485402f3113205f91d30 <
    c49b9256bbacb6a135654aebd12e4c0e87166b7c
  - >-
    Linux >= ed842faeb2bd49256f00485402f3113205f91d30 <
    837392a38445729c22e03d3abcf33f07763efd85
  - >-
    Linux >= ed842faeb2bd49256f00485402f3113205f91d30 <
    e71303a9190496136e240c4f2872b7b0b16027a7
  - >-
    Linux >= ed842faeb2bd49256f00485402f3113205f91d30 <
    850837965af15707fd3142c1cf3c5bfaf022299b
  - Linux 4.15
published: '2026-05-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:48:13.735Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-31752'
references:
  - url: 'https://git.kernel.org/stable/c/82a42eceec7c6bdb0e0da94c0542a173b7ea57f2'
  - url: 'https://git.kernel.org/stable/c/259466f76f5a2148aff11134e68f4b4c6d52725b'
  - url: 'https://git.kernel.org/stable/c/ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a'
  - url: 'https://git.kernel.org/stable/c/e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa'
  - url: 'https://git.kernel.org/stable/c/c49b9256bbacb6a135654aebd12e4c0e87166b7c'
  - url: 'https://git.kernel.org/stable/c/837392a38445729c22e03d3abcf33f07763efd85'
  - url: 'https://git.kernel.org/stable/c/e71303a9190496136e240c4f2872b7b0b16027a7'
  - url: 'https://git.kernel.org/stable/c/850837965af15707fd3142c1cf3c5bfaf022299b'
tags:
  - cve.org
epss: 0.00171
epssPercentile: 0.05676
ingestedAt: '2026-09-08T15:33:26.989Z'
---

## Overview

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

bridge: br_nd_send: validate ND option lengths

br_nd_send() walks ND options according to option-provided lengths.
A malformed option can make the parser advance beyond the computed
option span or use a too-short source LLADDR option payload.

Validate option lengths against the remaining NS option area before
advancing, and only read source LLADDR when the option is large enough
for an Ethernet address.

## Affected

- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2`
- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 259466f76f5a2148aff11134e68f4b4c6d52725b`
- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a`
- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa`
- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < c49b9256bbacb6a135654aebd12e4c0e87166b7c`
- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 837392a38445729c22e03d3abcf33f07763efd85`
- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < e71303a9190496136e240c4f2872b7b0b16027a7`
- `Linux >= ed842faeb2bd49256f00485402f3113205f91d30 < 850837965af15707fd3142c1cf3c5bfaf022299b`
- `Linux 4.15`

## Remediation

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