hyper v security

Microsoft disclosed CVE-2026-40402 on May 12, 2026, as a Critical Windows Hyper-V elevation-of-privilege vulnerability in its May Patch Tuesday release, describing a use-after-free flaw that can let an attacker in a guest virtual machine gain SYSTEM privileges on the Hyper-V host. The...

Microsoft disclosed CVE-2026-40401 on May 12, 2026, as an Important-rated Windows TCP/IP denial-of-service vulnerability caused by a null pointer dereference, affecting supported Windows client and server releases and remediated through the May 2026 security updates. The interesting part is not...

Microsoft’s CVE-2026-32149 entry is exactly the kind of advisory that security teams should read twice. The label says Windows Hyper-V Remote Code Execution Vulnerability, but the real story is in the confidence language: Microsoft is signaling not just that a flaw exists, but how certain it is...

Microsoft’s entry for CVE-2026-26156 is less about a dramatic exploit narrative and more about something security teams often underestimate: the signal Microsoft is sending about how real the issue is and how much technical detail is trustworthy. In the case of Hyper-V, that matters a great...

Microsoft has publicly registered CVE‑2026‑21244 as a serious Remote Code Execution (RCE) vulnerability in the Windows Hyper‑V stack, and administrators must treat it as an operational emergency: vendor guidance is live, patches are mapped to specific KBs, and defensive playbooks should be...

Microsoft’s own vulnerability listing shows an entry for CVE-2026-21247 tied to Windows Hyper‑V, but the public advisory contains little low‑level detail and renders via a dynamic web application that prevents straightforward scraping; the result is a vendor‑acknowledged vulnerability with...

Microsoft's security guidance for CVE-2026-21248 warns Windows administrators that a serious Remote Code Execution (RCE) vulnerability exists in Hyper‑V components used to bridge guest and host operations, and that immediate, prioritized remediation is required even though vendor advisories...