CVE-2014-8989: The Linux kernel through 3.17.4 does not properly restrict dropping of supplemental group memberships in ce...

Security readout for executives and security teams

This is an old Linux kernel permissions flaw. A local user could drop supplemental group memberships in namespace scenarios and bypass intended access controls when certain POSIX ACLs are configured. It is not described as remotely exploitable in the provided sources. Exposure is most likely on legacy Linux systems running kernels through 3.17.4, especially where user namespaces and POSIX ACLs protect local files. The source bundle cites Ubuntu, Fedora, and Mandriva advisories, but does not enumerate exact affected package versions. Treat this as a legacy local privilege and access-control risk. It is not a current remote emergency based on the provided evidence, but unsupported Linux kernels should be removed or updated because the flaw undermines file-permission assumptions. Mitigation focus: Inventory Linux systems running kernels through 3.17.4 or older.; Apply kernel updates from the relevant Linux distribution advisory.; Prioritize multi-user systems, containers, and namespace-enabled hosts..

Prepared

Jun 14, 2026, 06:22 UTC (UTC+00:00)

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