---
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'
cwe:
  - CWE-290
  - CWE-346
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: '2026-10-08'
sourceUpdated: '2026-10-08T20:46:35.260'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92542.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92542'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2547588'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-92542'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92542'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T20:30:27.853237Z'
cvssSource: cna
ingestedAt: '2026-10-07T17:40:37.544Z'
scores:
  cna: 6.9
  vendor: 7.1
epss: 0.00068
epssPercentile: 0.00032
---

## 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.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Multicluster Engine for Kubernetes, Multicluster Global Hub, Red Hat Ceph Storage 5, Red Hat Ceph Storage 7, Red Hat Ceph Storage 9, Red Hat Enterprise Linux 10, … · no fix planned: Multicluster Engine for Kubernetes, Multicluster Global Hub, Red Hat Ceph Storage 5, Red Hat Ceph Storage 7, … · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92542.json)