Xen Security Advisory 518 v2 (CVE-2026-79611) - VMX: VMentry failure with branch tracing and blocked states

As cited

Copy frozen at 2026-10-13 15:04 UTC (site build).

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Xen Security Advisory 518 v2 (CVE-2026-79611) - VMX: VMentry failure with branch tracing and blocked states

Xen released version 2 of Security Advisory 518, which addresses CVE-2026-79611 affecting VMX entry under specific combinations of processor state involving debug breakpoints, single stepping, and blocked interrupts. The advisory was made public on October 13, 2026.

Why it matters: Administrators running Xen hypervisors should apply patches for this VMX entry vulnerability to prevent potential guest-to-host privilege escalation or denial of service scenarios in virtualized environments.

Source published

2026-10-13 13:00 UTC

First seen by Cybersecurity Tracker

2026-10-13 13:57 UTC