CVE-2026-21248: 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 10.0.28000.1575Patch KB5077179 - 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 10.0.26100.32370Fixed in 10.0.26100.32313Patch KB5075942 - Upgrade
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Fixed in 10.0.26200.7840Fixed in 10.0.26200.7781Patch KB5077212 - Upgrade
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Fixed in 10.0.19045.6937Patch 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 10.0.17763.8389Patch KB5075904 - Upgrade
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Fixed in 10.0.19044.6937Patch KB5075912
Event History
Frequently Asked Questions
What is the severity of CVE-2026-21248?
CVE-2026-21248 is classified as a critical severity vulnerability due to its potential for remote code execution.
How do I fix CVE-2026-21248?
To fix CVE-2026-21248, users should apply the latest patches provided by Microsoft for affected Windows products.
Which products are affected by CVE-2026-21248?
CVE-2026-21248 affects various versions of Windows 10, Windows 11, and Windows Server operating systems.
Can I exploit CVE-2026-21248 remotely?
No, CVE-2026-21248 requires prior authorization to execute any code locally on the system.
What types of attacks can CVE-2026-21248 facilitate?
CVE-2026-21248 can facilitate remote code execution attacks, allowing attackers to run arbitrary code on the affected systems.