---
id: CVE-2021-3655
title: A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1
summary: >-
  A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1.
  Missing size validations on inbound SCTP packets may allow the kernel to read
  uninitialized memory.
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-909
  - CWE-20
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 5.14
  - linux_kernel = 5.14
  - enterprise_linux = 8.0
  - debian_linux = 9.0
patched:
  - linux_kernel 5.14
published: '2021-08-05'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:17:40.797'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-3655'
references:
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1984024'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1984024'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00308
epssPercentile: 0.21655
ingestedAt: '2026-10-08T22:11:53.739Z'
---

## Overview

A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.

## Affected

- `linux_kernel < 5.14`
- `linux_kernel = 5.14`
- `enterprise_linux = 8.0`
- `debian_linux = 9.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 5.14`