CVE-2014-5206: The do_remount function in fs/namespace.c in the Linux kernel through 3.16.1 does not maintain the MNT_LOCK...

Security readout for executives and security teams

This Linux kernel flaw can let a local user make a supposedly read-only bind mount writable again inside a user namespace. That can weaken sandbox protections that depend on read-only mounts. The bundle does not show remote exploitation or active exploitation evidence. Exposure is most likely on Linux systems running kernels through 3.16.1 with user namespaces enabled, especially where sandboxing or container-like isolation relies on read-only bind mounts. Prioritize remediation where multi-user access, hosting, containers, or sandboxed workloads run on old Linux kernels. For isolated single-user systems, urgency is lower but still warrants normal kernel patching. Mitigation focus: Update affected Linux kernels using vendor-supported kernel packages.; Confirm the update includes upstream commit a6138db815df5ee542d848318e5dae681590fccd or an equivalent backport.; Review Ubuntu USN-2317-1 and USN-2318-1 if using affected Ubuntu kernels..

Prepared

Jun 14, 2026, 07:14 UTC (UTC+00:00)

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