CVE-2026-85829

7.8High

Published 13 Oct 2026 · NVD status: Undergoing Analysis · AI triage by gemini-3.8-flash

7.8High

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-415

Impact

A local user with low privileges can gain elevated SYSTEM permissions on the host. They must already have authenticated local access to trigger it.

Root cause

A double free flaw exists in the Windows Wired AutoConfig Service (dot3svc).

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Install the relevant Microsoft security update for your Windows version once published, or stop and disable the Wired AutoConfig service (dot3svc) if 802.1X wired authentication is not required.

shell

$ powershell -Command "Stop-Service -Name dot3svc -Force; Set-Service -Name dot3svc -StartupType Disabled"

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Double free in Windows Wired AutoConfig Service allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85829

Source: nvd.nist.gov/vuln/detail/CVE-2026-85829