Windows 10 Version 1607: Elevation of privilege in Windows Kernel
Summary
Microsoft has fixed an integer overflow (CWE-190) in the Windows kernel of Windows 10 Version 1607 and Windows Server 2016. An authorized local user with a low-privilege account can elevate privileges, for example to SYSTEM. Remote exploitation is not possible; the attacker first needs a local foothold, such as phishing, stolen credentials or a malicious file. The CVSS v3.1 base score is 7.8 (High).
Affected
- Windows 10 Version 1607 (32-bit and x64): builds 10.0.14393.0 to before 10.0.14393.9612
- Windows Server 2016: builds 10.0.14393.0 to before 10.0.14393.9612
Fixed in
- Build 10.0.14393.9612 or later (per the CNA record; verify on the Microsoft Security Update Guide)
- Apply the October 2026 security update for this CVE. No KB article for 1607 was confirmed.
Workaround
Unknown. No vendor workaround is documented. If patching is not possible, restrict local logon and standard-user access on affected hosts (general practice, not specific to this CVE).
Exploitation
- Publicly disclosed: No
- Exploited in the wild: No
- Exploit code maturity: Unproven
- CISA SSVC: Exploitation none, Automatable no, Technical impact total
- EPSS: 0.00333 (very low)
Our recommendation
- Inventory all Windows 10 1607 and Windows Server 2016 hosts and confirm their build numbers.
- Deploy the October 2026 security update on all hosts that are still supported.
- Check the Microsoft lifecycle page for 1607 and Server 2016 and plan an OS upgrade or isolation for hosts that are out of support.
- Give priority to shared terminal servers, RDP hosts, kiosk and POS systems, and machines used by many staff.
- Monitor for unusual privilege changes and new local administrator accounts.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Kernel
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5127648, KB5126651, KB5126655, KB5126657, KB5126646, KB5126653
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-83918 msrc.microsoft.com
- CNA affected-version data (vulners CVELIST) vulners.com
- CVSS, SSVC and patch guidance (OpenCVE) app.opencve.io
- EPSS and references (vulners NVD) vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 2 Nov 2026, 02:33.
Original description (NVD)
Integer overflow or wraparound in Windows Kernel allows an authorized attacker to elevate privileges locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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