Summary
Impact: Elevation of Privilege. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What privileges could an attacker gain by exploiting this vulnerability?
An attacker operating inside a guest virtual machine could execute code on the host in the security context of the virtual machine worker process.
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.
Security updates
10.0.20348.5870 — https://support.microsoft.com/help/5131090
10.0.19044.7846 — https://support.microsoft.com/help/5131096
10.0.26100.33822 — https://support.microsoft.com/help/5131080
10.0.26100.33730 — https://support.microsoft.com/help/5131077
10.0.26200.9974 — https://support.microsoft.com/help/5132061
10.0.26200.9911 — https://support.microsoft.com/help/5132043
10.0.22631.7711 — https://support.microsoft.com/help/5131087
10.0.28000.3501 — https://support.microsoft.com/help/5132059
Vulnerabilities 1
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High 7.8
Windows Hyper-V Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.
Revision history
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#1
Information published.
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#2
Updated an acknowledgement. This is an informational change only.
References
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CVE-2026-113856 Windows Hyper-V Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-113856
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss