Microsoft Windows Graphics Kernel: Local privilege escalation via out-of-bounds read

Summary

The Windows Graphics Kernel contains an out-of-bounds read (CWE-125) that allows an authorized local attacker to elevate privileges. The attacker needs low privileges and a way to run code on the system, for example through phishing or a malicious app. The CVSS 3.1 score is 7.8 (High), with high impact on confidentiality, integrity and availability.

Affected

• Windows 10 Version 1607 and Windows Server 2016 (including Server Core): 10.0.14393.0 to before 10.0.14393.9688
• Windows 10 Version 1809 and Windows Server 2019 (including Server Core): 10.0.17763.0 to before 10.0.17763.9487
• Windows 10 Version 21H2: 10.0.19044.0 to before 10.0.19044.7846
• Windows 10 Version 22H2: 10.0.19045.0 to before 10.0.19045.7846 (range taken from a secondary source, verify on MSRC)
• 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
• Windows 11 Version 26H1: 10.0.28000.0 to before 10.0.28000.3501
• Windows 11 Version 26H2: 10.0.26300.0 to before 10.0.26300.9974
• Windows Server 2022: 10.0.20348.0 to before 10.0.20348.5870

Fixed in

• Windows 10 Version 1607 and Windows Server 2016: 10.0.14393.9688 or later
• Windows 10 Version 1809 and Windows Server 2019: 10.0.17763.9487 or later
• Windows 10 Version 21H2: 10.0.19044.7846 or later
• Windows 10 Version 22H2: 10.0.19045.7846 or later
• Windows 11 Version 23H2: 10.0.22631.7711 or later
• Windows 11 Version 24H2: 10.0.26100.9974 or later
• Windows 11 Version 25H2: 10.0.26200.9974 or later
• Windows 11 Version 26H1: 10.0.28000.3501 or later
• Windows 11 Version 26H2: 10.0.26300.9974 or later
• Windows Server 2022: 10.0.20348.5870 or later

The build numbers are the first builds outside the affected ranges in the CVE record. Confirm the matching cumulative update on MSRC.

Workaround

Unknown. No mitigation or workaround was found in the sources. Patching is the remedy.

Exploitation

• Not known to be exploited in the wild as of 10 November 2026.
• No public proof of concept or exploit code is known.
• CISA SSVC assessment: exploitation none, not automatable, total technical impact.
• The record was published on 10 November 2026, so this status may change.

Our recommendation

• Identify Windows endpoints and servers with affected builds, starting with Windows 10 1607, 1809, 21H2 and 22H2.
• Check the support status of these builds, because older builds may no longer receive fixes.
• Apply the MSRC cumulative update for each affected build as soon as possible.
• Prioritise shared or multi-user systems, such as terminal servers and kiosks, and systems with untrusted local users.
• Monitor for unusual privilege escalation activity until patching is complete.

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

• CVE.org record www.cve.org
• MSRC Security Update Guide msrc.microsoft.com
• OffSeq threat radar radar.offseq.com
• Strix CVE entry (secondary) 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, 02:28.