CVE-2016-6213: fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount namesp...

Security readout for executives and security teams

A local user can make vulnerable Linux systems consume kernel memory and potentially deadlock by abusing mount namespace behavior. It is not described as remote code execution. Business impact is service disruption on systems that allow local users, containers, or workloads with relevant mount capabilities. Exposure is most relevant on Linux systems running kernels before 4.9 or vendor kernels lacking the backported fix, especially multi-user servers, shared hosting, build workers, and container hosts. Distribution backports may change version-based assessment. Treat as a platform hardening and availability issue. Prioritize shared Linux infrastructure and container hosts over isolated single-user systems. Patch through normal kernel maintenance unless local untrusted access is common or service availability risk is high. Mitigation focus: Apply vendor kernel updates containing the upstream mount namespace fix.; Review Red Hat RHSA-2017:1842 and RHSA-2017:2077 if using affected Red Hat platforms.; Prioritize systems with untrusted local users or containerized workloads..

Prepared

Jun 13, 2026, 12:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.