CVE-2015-4176: fs/namespace.c in the Linux kernel before 4.0.2 does not properly support mount connectivity, which allows...

Security readout for executives and security teams

This is a local Linux kernel flaw, not a remote internet-facing bug. A user who already has local access and user-namespace root could read files they should not be able to read. Business urgency depends on whether affected systems allow untrusted shell, container, or multi-tenant workloads. Exposure is most likely on Linux systems running kernels before 4.0.2 or vendor kernels lacking the backported fix, especially where untrusted users, containers, or user namespaces are available. Distribution package status cannot be inferred from upstream version alone. Handle this through normal kernel patch management, with higher priority for multi-user or container-heavy environments. It is not evidenced as actively exploited in the provided sources, but arbitrary local file read can expose sensitive data on shared systems. Mitigation focus: Update affected Linux kernels using vendor-supported packages that include the upstream fix.; Confirm whether your distribution backported commit e0c9c0afd2fc into older kernel packages.; Check vendor advisories for supported mitigation guidance if immediate patching is not possible..

Prepared

Jun 13, 2026, 14:44 UTC (UTC+00:00)

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