CVE-2012-6030: The do_tmem_op function in the Transcendent Memory (TMEM) in Xen 4.0, 4.1, and 4.2 allow local guest OS use...

Security readout for executives and security teams

This is an old Xen hypervisor vulnerability affecting Transcendent Memory handling in Xen 4.0, 4.1, and 4.2. A user inside a guest operating system could crash the host, disrupting all virtual machines on that host. Other impacts were described as possible but unspecified in the provided sources. Exposure is most relevant to legacy Xen 4.0, 4.1, or 4.2 deployments where guest users can reach TMEM hypercall functionality. Public cloud, hosting, lab, or multi-tenant virtualization environments would carry higher business risk because one guest could affect host availability. Treat as high priority for any remaining legacy Xen estate, especially shared hosting or tenant-facing environments. The main risk is host-level outage caused from inside a guest, which can affect multiple workloads at once. Modernized or fully patched Xen deployments are likely lower concern. Mitigation focus: Inventory Xen hosts and identify any Xen 4.0, 4.1, or 4.2 systems.; Review Xen XSA-15 and distribution advisories for supported fixes or mitigations.; Apply vendor-supported Xen or distribution security updates where available..

Prepared

Jun 24, 2026, 12:04 UTC (UTC+00:00)

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