GHSA-4vq8-7jfc-9cvp

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GHSA-4vq8-7jfc-9cvp

Summary: Moby firewalld reload removes bridge network isolation

Details: Moby is an open source container framework developed by Docker Inc. that is distributed as Docker Engine, Mirantis Container Runtime, and various other downstream projects/products. The Moby daemon component (dockerd), which is developed as [moby/moby](https://github.com/moby/moby) is commonly referred to as Docker, or Docker Engine. Firewalld is a daemon used by some Linux distributions to provide a dynamically managed firewall. When Firewalld is running, Docker uses its iptables backend to create rules, including rules to isolate containers in one bridge network from containers in other bridge networks. ### Impact The iptables rules created by Docker are removed when firewalld is reloaded using, for example "firewall-cmd --reload", "killall -HUP firewalld", or "systemctl reload firewalld". When that happens, Docker must re-create the rules. However, in affected versions of Docker, the iptables rules that isolate containers in different bridge networks from each other are not re-created. Once these rules have been removed, containers have access to any port, on any container, in any non-internal bridge network, running on the Docker host. Containers running in networks created with `--internal` or equivalent have no access to other networks. Containers that are only connected to these networks remain isolated after a firewalld reload. Where Docker Engine is not running in the host's network namespace, it is unaffected. Including, for example, Rootless Mode, and Docker Desktop. ### Patches Moby releases 28.0.0 and newer are not affected. A fix is available in moby release 25.0.13. ### Workarounds After reloading firewalld, either: - Restart the docker daemon, - Re-create bridge networks, or - Use rootless mode. ### References https://firewalld.org/ https://firewalld.org/documentation/howto/reload-firewalld.html

References: https://github.com/moby/moby/security/advisories/GHSA-4vq8-7jfc-9cvp, https://nvd.nist.gov/vuln/detail/CVE-2025-54410, https://github.com/moby/moby/pull/49443, https://github.com/moby/moby/pull/49728, https://firewalld.org/documentation/howto/reload-firewalld.html, https://github.com/moby/moby