CVE-2026-92542

Blind VXLAN injection into encrypted overlay networks from cluster peer

Published Oct 7, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
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

Vendor Workaround

Block userspace processes from sending UDP packets to the Swarm data-path port. iptables -I OUTPUT -p udp --dport "$(docker info --format '{{.Swarm.Cluster.DataPathPort}}')" -m owner --socket-exists -j DROP

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Docker
Docker docker Engine
Docker docker Engine Overlay Network Driver
Moby
Moby moby Overlay Network Driver
Vendors & Products Docker
Docker docker Engine
Docker docker Engine Overlay Network Driver
Moby
Moby moby Overlay Network Driver
Type Values Removed Values Added
Weaknesses CWE-346
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'}

threat_severity

Important

Type Values Removed Values Added
Weaknesses CWE-20
CWE-284
Type Values Removed Values Added
Weaknesses CWE-290
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-20
CWE-284
Type Values Removed Values Added
Description 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
Title Blind VXLAN injection into encrypted overlay networks from cluster peer
References
Metrics cvssV4_0

{'score': 6.9, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Docker
Published
Updated
Oct 7, 2026, 8:30 PM
Reserved
Sep 16, 2026, 1:00 PM
Status
Awaiting Analysis
Published
Oct 7, 2026, 5:17 PM
Modified
Oct 8, 2026, 8:46 PM
Severity
Important
Public date
Oct 7, 2026, 4:42 PM