Use-After-Free Vulnerability in Linux Kernel's Netfilter Subsystem

Summary

The article discusses a critical use-after-free vulnerability in the netfilter subsystem of the Linux kernel, which can potentially allow local, unprivileged users with CAP_NET_ADMIN capability to escalate their privileges. The flaw was identified in the upstream commit 5f68718b34a5, and Red Hat confirmed that it does not affect any shipped kernel releases of Red Hat Enterprise Linux (RHEL) 6, 7, and 8, but it does affect the OpenShift Container Platform (OCP) based on Red Hat Enterprise Linux CoreOS (RHCOS). Mitigation strategies include controlling the ability to create user/net namespaces, but for containerized deployments, the functionality needs to remain enabled. The impact on Red Hat Enterprise Linux and OpenShift environments is limited due to existing permissions and namespace configurations, but administrators are advised to implement the recommended mitigations to safeguard their systems against potential exploitation.

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