---
id: CVE-2026-92542
title: >-
  The firewall rules which mark VXLAN datagrams for encryption indiscriminately
  match both authentic VXLAN datagrams sent from the kernel and forged datagrams
  sent by user processes
summary: >-
  The firewall rules which mark VXLAN datagrams for encryption indiscriminately
  match both authentic VXLAN datagrams sent from the kernel and forged datagrams
  sent by user processes. Any packet sent from the host network namespace of a
  Lin…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'
vendor: Docker
product: Docker Engine
affected:
  - engine < 25.0.19
  - engine >= 26.0.0 < 29.8.2
  - github.com/docker/docker/libnetwork/drivers/overlay < v25.0.19
  - github.com/docker/docker/libnetwork/drivers/overlay >= v26.0.0 < *
  - >-
    github.com/moby/moby/v2/daemon/libnetwork/drivers/overlay >= v2.0.0-beta.0 <
    v2.0.0-beta.25
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T17:17:02.580'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92542'
references:
  - url: 'https://github.com/moby/moby/security/advisories/GHSA-6m9p-4h64-m6vh'
    label: security@docker.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-07T17:40:37.544Z'
---

## Overview

The firewall rules which mark VXLAN datagrams for encryption indiscriminately match both authentic VXLAN datagrams sent from the kernel and forged datagrams sent by user processes. Any packet sent from the host network namespace of a Linux Swarm node is encrypted with the overlay-network IPsec parameters which meets the following criteria:

- UDP datagram
- Destination port is the Swarm data-path port
- Datagram starts with a VXLAN header for the VNI of an encrypted overlay network which any running container on the node is connected to

## Remediation

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