CVE-2026-21244: Windows Hyper-V Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
Other sources
Windows Hyper-V Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.8868Patch KB5075999 - Upgrade
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Fixed in 10.0.26100.7840Fixed in 10.0.26100.7781Patch KB5077212 - Upgrade
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Fixed in 10.0.22631.6649Patch KB5075941 - Upgrade
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Fixed in 10.0.25398.2149Patch KB5075897 - Upgrade
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Fixed in 10.0.19045.6937Patch KB5075912 - Upgrade
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Fixed in 10.0.26200.7840Fixed in 10.0.26200.7781Patch KB5077212 - Upgrade
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Fixed in 10.0.19044.6937Patch KB5075912 - Upgrade
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Fixed in 10.0.20348.4773Fixed in 10.0.20348.4711Patch KB5075943 - Upgrade
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Fixed in 10.0.26100.32370Fixed in 10.0.26100.32313Patch KB5075942 - Upgrade
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Fixed in 10.0.17763.8389Patch KB5075904 - Upgrade
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Fixed in 10.0.28000.1575Patch KB5077179
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21244?
CVE-2026-21244 is rated as a critical severity vulnerability with potential for remote code execution.
How do I fix CVE-2026-21244?
To fix CVE-2026-21244, apply the latest security patches provided by Microsoft for your affected Windows products.
What systems are affected by CVE-2026-21244?
CVE-2026-21244 affects various versions of Windows Server and Windows 10/11 products, including specific builds.
What type of vulnerability is CVE-2026-21244?
CVE-2026-21244 is a heap-based buffer overflow vulnerability within Windows Hyper-V.
Can CVE-2026-21244 be exploited remotely?
Yes, CVE-2026-21244 can potentially be exploited by an authorized attacker to execute code locally.