CVE-2026-83931
7.8HighPublished 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-122
Impact
An attacker with local user access to a guest VM can execute arbitrary code on the Hyper-V host. They need authenticated local access to a virtual machine to trigger the escape.
Root cause
A heap-based buffer overflow in Windows Hyper-V allows memory corruption during host-guest operations.
Affected systems
Versions not listed — check the vendor advisory.
CVSS v3.1 · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Fix & remediation
Install the relevant Microsoft security update referenced in the MSRC advisory; if patching must wait, restrict guest VM access to trusted users.
AI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD description
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.