CVE-2012-2121: The KVM implementation in the Linux kernel before 3.3.4 does not properly manage the relationships between...

Security readout for executives and security teams

This is a legacy Linux KVM virtualization flaw. A guest administrator could trigger device hotplug and hotunplug behavior that leaks host memory and can crash the host, disrupting all workloads on that host. Exposure is most likely on old Linux KVM hosts using vulnerable kernels and device assignment/IOMMU features where guest administrators can perform device hotplug or hotunplug operations. Prioritize remediation for any remaining legacy KVM infrastructure, especially multi-tenant or delegated-administration environments. Modern patched hosts are unlikely to be exposed. Mitigation focus: Update affected KVM hosts to a fixed kernel or vendor-patched package.; Use Linux kernel 3.3.4 or later where applicable.; Review Red Hat and Ubuntu advisories for distribution-specific fixed versions..

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.