---
id: CVE-2022-3586
title: A flaw was found in the Linux kernel’s networking code
summary: >-
  A flaw was found in the Linux kernel’s networking code. A use-after-free was
  found in the way the sch_sfb enqueue function used the socket buffer (SKB) cb
  field after the same SKB had been enqueued (and freed) into a child qdisc.
  This fl…
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'
cwe:
  - CWE-416
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.39, <= 5.19'
  - linux_kernel = 6.0
  - debian_linux = 10.0
published: '2022-10-19'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T14:17:24.750'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-3586'
references:
  - url: 'https://github.com/torvalds/linux/commit/9efd23297cca'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html'
    label: secalert@redhat.com
  - url: 'https://www.zerodayinitiative.com/advisories/upcoming/'
    label: secalert@redhat.com
  - url: 'https://github.com/torvalds/linux/commit/9efd23297cca'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.zerodayinitiative.com/advisories/upcoming/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-831302.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00487
epssPercentile: 0.4096
zeroDay: true
ingestedAt: '2026-10-14T15:36:13.923Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-05-09T14:48:08.642083Z'
---

## Overview

A flaw was found in the Linux kernel’s networking code. A use-after-free was found in the way the sch_sfb enqueue function used the socket buffer (SKB) cb field after the same SKB had been enqueued (and freed) into a child qdisc. This flaw allows a local, unprivileged user to crash the system, causing a denial of service.

## Affected

- `linux_kernel >= 2.6.39, <= 5.19`
- `linux_kernel = 6.0`
- `debian_linux = 10.0`

## Remediation

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