Microsoft Windows Kernel: Out-of-bounds read enabling local privilege escalation

Summary

A out-of-bounds read in the Windows kernel allows an authorized local user to elevate privileges to the highest system level. An attacker needs valid low-privilege access to the system, so the flaw is not directly reachable from the internet. It is most relevant after an attacker has gained a foothold, for example through a phished user or a compromised low-privilege account.

Affected

• Windows 10 Version 1607 (builds before 10.0.14393.9688)
• Windows 10 Version 1809 (builds before 10.0.17763.9487)
• Windows 10 Version 21H2 (builds before 10.0.19044.7846)
• Windows 10 Version 22H2 (builds before 10.0.19045.7846)
• Windows 11 Version 23H2 (builds before 10.0.22631.7711)
• Windows 11 Version 24H2 (builds before 10.0.26100.9974)
• Windows 11 Version 25H2 (builds before 10.0.26200.9974)
• Windows 11 Version 26H1 (builds before 10.0.28000.3501)
• Windows 11 Version 26H2 (builds before 10.0.26300.9974)
• Windows Server 2016 incl. Server Core (builds before 10.0.14393.9688)
• Windows Server 2019 incl. Server Core (builds before 10.0.17763.9487)
• Windows Server 2022 (builds before 10.0.20348.5870)

Fixed in

• Install the Microsoft security update for the respective Windows version that brings the build to or above the fixed build listed under Affected.
• Confirm the exact fixed builds and KB numbers on the MSRC advisory, which could not be retrieved for this entry.

Workaround

Unknown.

Exploitation

• No public proof of concept, in-the-wild exploitation or CISA KEV listing was found in limited searches.
• CISA SSVC: exploitation none, automatable no, technical impact total.
• CVSS exploit code maturity is 'unproven' (E:U).

Our recommendation

• Patch affected Windows systems in the normal monthly cycle, and prioritize multi-user systems, terminal/RDP servers and hosts with limited user accounts.
• Inventory all Windows 10 1607 and 1809 systems first, as these older releases are a high exposure, and check the MSRC advisory for exact fixed builds.
• Re-check MSRC exploitability fields and CISA KEV within a few days.
• Monitor for unusual privilege changes and new local admin accounts.

Public exploits iAttack code is publicly available (PoC on GitHub, Metasploit or Exploit-DB).

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

• MSRC Security Update Guide: CVE-2026-122183 msrc.microsoft.com
• CVE.org record: CVE-2026-122183 www.cve.org
• Strix: CVE-2026-122183 (third-party aggregator) www.strix.ai

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 11 Nov 2026, 03:27.