CVE-2026-83839
7.0HighPublished 13 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
- Impact
- Full C/I/A compromise
- Weakness
- CWE-367
Impact
A local attacker with an existing account can escalate privileges to execute code with elevated permissions on Windows Hyper-V. Exploitation requires local authenticated access and winning a race condition.
Root cause
A time-of-check to time-of-use (TOCTOU) race condition in Hyper-V mishandles validation between inspection and operation.
Affected systems
Versions not listed — check the vendor advisory.
CVSS v3.1 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Fix & remediation
Install the official Windows security update referenced in the Microsoft Security Response Center advisory once published; restrict untrusted local user access to the Hyper-V host if immediate patching is not possible.
AI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD description
Time-of-check time-of-use (toctou) race condition in Windows Hyper-V allows an authorized attacker to elevate privileges locally.