CVE-2014-9717: fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying...

Security readout for executives and security teams

This Linux kernel issue lets a local user bypass a mount restriction in some namespace scenarios. It is not described as remotely exploitable. Business urgency is highest for systems running untrusted local users, containers, or user-namespace workloads on kernels before the fix. Exposure is most plausible on Linux systems with kernels before 4.0.2 or vendor kernels lacking the backport, especially where untrusted users or containerized workloads can use user namespaces. Treat as a targeted kernel hygiene issue, not an internet-scale emergency. Prioritize patch confirmation on container hosts, shared Linux servers, and environments with untrusted local users. Mitigation focus: Update to a vendor-supported kernel containing the upstream fix or a confirmed backport.; Use vendor advisories to map fixed package versions for each distribution.; Prioritize multi-tenant Linux, container hosts, and systems allowing untrusted local shell access..

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.