CVE-2025-57851: Red Hat Advanced Cluster Management For Kubernetes

Medium severity, CVSS 6.7. EPSS: 0.1% chance of exploitation in the next 30 days.

A container privilege escalation flaw was found in certain Multicluster Engine for Kubernetes images. This issue stems from the /etc/passwd file being created with group-writable permissions during build time. In certain conditions, an attacker who can execute commands within an affected container, even as a non-root user, can leverage their membership in the root group to modify the /etc/passwd file. This could allow the attacker to add a new user with any arbitrary UID, including UID 0, leading to full root privileges within the container.

Affected products

• Red Hat Advanced Cluster Management For Kubernetes: affected versions not specified

Published 2026-04-08. Last modified 2026-07-24.