CVE-2026-83839 Windows Hyper-V - Privilege Escalation

Windows Hyper-V contains a time-of-check time-of-use (TOCTOU) race condition, letting authorized local attackers elevate privileges, exploit requires local access with authorization.

CVSS base score 7.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.19% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-367

Vendor fix

Update to the latest Windows Hyper-V version with security patches.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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