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Windows: Privilege escalation in Graphics Kernel via integer overflow

CVE-2026-119966High 7.5

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Summary

A local integer overflow in the Windows Graphics Kernel allows an authorized attacker to elevate privileges on affected Windows 11 and Windows Server 2025 systems. The attacker needs an existing local foothold, such as a valid low-privileged account or code running on the machine, and the attack complexity is high. The main risk is turning a compromised user session into SYSTEM level control, especially on multi-user systems.

Affected

  • Windows 11 version 23H2: 10.0.22631.0 to before 10.0.22631.7711
  • Windows 11 version 24H2: 10.0.26100.0 to before 10.0.26100.9974
  • Windows 11 version 25H2: 10.0.26200.0 to before 10.0.26200.9974 (per CVE record; verify on MSRC)
  • Windows 11 version 26H2: 10.0.26300.0 to before 10.0.26300.9974 (per CVE record; verify on MSRC)
  • Windows Server 2025 (including Server Core): 10.0.26100.0 to before 10.0.26100.33822 (per CVE record; verify on MSRC)
  • Windows 10 and older branches: Unknown.

Fixed in

  • Security update released with the November 2026 Patch Tuesday for the affected builds listed above.
  • Fixed builds: 10.0.22631.7711 (23H2), 10.0.26100.9974 (24H2), 10.0.26200.9974 (25H2), 10.0.26300.9974 (26H2), 10.0.26100.33822 (Server 2025).
  • KB article numbers: Unknown. See the MSRC Knowledge Base Articles section.

Workaround

Unknown. No workaround or mitigation was found in the sources reviewed. Patching is the only documented remediation.

Exploitation

  • Microsoft lists Exploit Code Maturity as Unproven and Exploited as No.
  • CISA SSVC assessment: Exploitation none, Automatable no, Technical Impact total.
  • No public proof of concept was found. This does not rule one out.
  • The in-the-wild zero-day in this release has been reported as an Outlook flaw, not this CVE.

Our recommendation

  • Install the November 2026 security update on all affected Windows 11 and Windows Server 2025 systems through the normal Patch Tuesday cycle.
  • Prioritize multi-user systems such as Remote Desktop or terminal servers, file servers with local logons, and shared workstations.
  • Verify the affected and fixed build lists for 25H2, 26H2 and Server 2025 on the MSRC page before relying on them.
  • Monitor for unexpected privilege escalation, new local administrator accounts or suspicious SYSTEM processes.
  • Recheck MSRC and CISA KEV in the coming days, as the status may change.

Information from Microsoft (Patch Tuesday November 2026)

Severity (Microsoft)
Critical
Impact
Elevation of privilege – Windows Graphics Kernel
Status on Patch Tuesday
Neither exploited nor publicly disclosed
Exploitability assessment
Exploitation less likely
Product family
Windows
Updates (KB)
KB5131087, KB5132061, KB5132043, KB5131080, KB5131077

Entry in the Microsoft Security Update Guide

Public exploits

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

Research sources

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, 05:24.

Original description (NVD)

Integer overflow or wraparound in Windows Graphics Kernel allows an authorized attacker to elevate privileges locally.

NVD references (1)

Sources

The tracker combines official, freely usable data sources – updated continuously:

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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