CVE-2009-1338: The kill_something_info function in kernel/signal.c in the Linux kernel before 2.6.28 does not consider PID...

Security readout for executives and security teams

CVE-2009-1338 is a Linux kernel namespace-isolation flaw. A local user on affected older kernels could send signals beyond their intended PID namespace, potentially disrupting processes outside their container or isolation boundary. Exposure is most likely on legacy Linux systems or appliances still running kernels before 2.6.28, especially systems using PID namespaces or early container-style isolation. Current supported distributions are unlikely affected if vendor security updates were applied. Treat as a legacy-platform risk. It is not an internet-facing remote exploit in the provided evidence, but it can weaken tenant or process isolation on outdated Linux systems. Mitigation focus: Upgrade affected Linux kernels or distribution kernel packages using vendor advisories.; Prioritize hosts running containers, PID namespaces, or untrusted local workloads.; Check Red Hat, Ubuntu, Debian, and other vendor guidance for fixed package versions..

Prepared

Jun 28, 2026, 11:04 UTC (UTC+00:00)

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