---
id: CVE-2025-40331
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sctp: Prevent TOCTOU out-of-bounds write

  For the following path not holding the sock lock,

    sctp_diag_dump() -> sctp_for_each_endpoint() -> sctp_ep_dump()

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

  sctp: Prevent TOCTOU out-of-bounds write

  For the following path not holding the sock lock,

    sctp_diag_dump() -> sctp_for_each_endpoint() -> sctp_ep_dump()

  make sure…
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'
published: '2025-12-09'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40331'
references:
  - url: 'https://git.kernel.org/stable/c/2fe08fcaacb7eb019fa9c81db39b2214de216677'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3006959371007fc2eae4a078f823c680fa52de1a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/584307275b2048991b2e8984962189b6cc0a9b85'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/72e3fea68eac8d088e44c3dd954e843478e9240e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/89eac1e150dbd42963e13d23828cb8c4e0763196'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/95aef86ab231f047bb8085c70666059b58f53c09'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b106a68df0650b694b254427cd9250c04500edd3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c9119f243d9c0da3c3b5f577a328de3e7ffd1b42'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00188
epssPercentile: 0.07848
ingestedAt: '2026-10-14T23:00:02.030Z'
---

## Overview

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

sctp: Prevent TOCTOU out-of-bounds write

For the following path not holding the sock lock,

  sctp_diag_dump() -> sctp_for_each_endpoint() -> sctp_ep_dump()

make sure not to exceed bounds in case the address list has grown
between buffer allocation (time-of-check) and write (time-of-use).

## Remediation

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