Windows Kernel: Use-after-free allowing local privilege escalation

Summary

A use-after-free vulnerability (CWE-416) in the Windows kernel allows an authorized local attacker to elevate privileges. The attacker needs an existing local account or a foothold on the host, and attack complexity is high. Successful exploitation can give full control of the affected system, so shared workstations, terminal servers and multi-user systems carry the highest risk.

Affected

• Windows 10 Version 1607 (10.0.14393.0 before 10.0.14393.9688)
• Windows 10 Version 1809 (10.0.17763.0 before 10.0.17763.9487)
• Windows 10 Version 21H2 (10.0.19044.0 before 10.0.19044.7846)
• Windows 10 Version 22H2 (10.0.19045.0 before 10.0.19045.7846)
• Windows 11 Version 23H2 (10.0.22631.0 before 10.0.22631.7711)
• Windows 11 Version 24H2 (10.0.26100.0 before 10.0.26100.9974)
• Windows 11 Version 25H2 (10.0.26200.0 before 10.0.26200.9974)
• Windows 11 Version 26H1 (10.0.28000.0 before 10.0.28000.3501)
• Windows 11 Version 26H2 (10.0.26300.0 before 10.0.26300.9974)
• Windows Server 2016, including Server Core (10.0.14393.0 before 10.0.14393.9688)
• Windows Server 2019, including Server Core (10.0.17763.0 before 10.0.17763.9487)
• Windows Server 2022 (10.0.20348.0 before 10.0.20348.5870)

Fixed in

• Install Microsoft's November 2026 security update for your Windows version. The build numbers listed above are the first fixed builds according to the CVE record.
• KB numbers per build: Unknown. Take them from the MSRC advisory.

Workaround

Unknown.

• No vendor workaround was found. Patching is the practical remediation.

Exploitation

• CISA SSVC assessment: exploitation none, automatable no, technical impact total.
• Microsoft's exploit code maturity is 'Unproven' (E:U), so no public exploit code was known at publication.
• No confirmed in-the-wild exploitation or CISA KEV listing was found. This is not confirmed absent.

Our recommendation

• Apply the November 2026 cumulative update as part of regular Patch Tuesday, after checking the build numbers on the MSRC page.
• Prioritise shared workstations, terminal and RDP servers, and hosts where untrusted code or macros run.
• Confirm the support status of Windows 10 1607 and 1809 and plan an upgrade where patches are no longer available.
• Monitor MSRC and NVD updates, CISA KEV additions and public PoC reports, as the exploit status may change.

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

• Microsoft Security Update Guide: CVE-2026-112790 msrc.microsoft.com
• CVE.org record CVE-2026-112790 www.cve.org
• Strix AI: CVE-2026-112790 (unverified aggregator) www.strix.ai
• NewsBeep: Patch Tuesday November 2026 coverage www.newsbeep.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 11 Nov 2026, 09:16.