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Date: Wed, 19 Dec 2018 05:08:07 -0500 (EST)
From: Vladis Dronov <>
Subject: CVE-2018-16884: Linux kernel: nfs: use-after-free in


A flaw was found in the Linux kernel in the NFS4 subsystem. NFS41+ shares mounted
in different network namespaces at the same time can make bc_svc_process() use wrong
back-channel id and cause a use-after-free. Thus a malicious container user can cause
a host kernel memory corruption and a system panic. Due to the nature of the flaw,
privilege escalation cannot be fully ruled out.

The CVE-2018-16884 id was assigned to this flaw and proposed to MITRE. We would like
to suggest to use this id in public communications regarding this flaw.

A proposed patchset and a discussion:


Best regards,
Vladis Dronov | Red Hat, Inc. | Product Security Engineer

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