CVE-2011-4621: The Linux kernel before 2.6.37 does not properly implement a certain clock-update optimization, which allow...

Security readout for executives and security teams

CVE-2011-4621 is an old Linux kernel denial-of-service issue. A local user could run an application that keeps the CPU in a tight loop and trigger a system hang. This is mainly a risk for shared systems or hosts where untrusted users can execute local code. Exposure is likely limited to legacy Linux systems running kernels older than 2.6.37, or vendor-maintained kernels without the relevant backport. Internet-only exposure is not indicated because the issue requires local code execution. Treat this as a legacy platform hygiene issue, not an emergency internet-facing flaw. Prioritize shared servers and unsupported kernels, because a local denial of service can still disrupt critical workloads. Mitigation focus: Upgrade affected systems to Linux 2.6.37 or a vendor kernel containing the upstream fix.; Check vendor advisories for backported fixes on enterprise distributions.; Restrict local shell or code execution access on legacy shared systems..

Prepared

Jun 24, 2026, 12:52 UTC (UTC+00:00)

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