Windows Kernel: Information disclosure through uninitialized memory objects
Summary
The Windows kernel initializes some objects in memory incorrectly, which can leak a small amount of kernel memory. An authenticated local attacker with low privileges can run a specially crafted application to obtain this information. The leaked data can help an attacker who already has code execution to bypass memory-layout protections, but it does not compromise the system on its own.
Affected
- 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 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)
- Windows Server 2025, including Server Core (10.0.26100.0 before 10.0.26100.33822)
Fixed in
- Install the Microsoft security update from the November 2026 Patch Tuesday for the affected product.
- Fixed builds per the CVE record: 10.0.17763.9487 (1809 and Server 2019), 10.0.19044.7846 (21H2), 10.0.19045.7846 (22H2), 10.0.22631.7711 (23H2), 10.0.20348.5870 (Server 2022), 10.0.26100.9974 (24H2), 10.0.26100.33822 (Server 2025), 10.0.26200.9974 (25H2), 10.0.28000.3501 (26H1), 10.0.26300.9974 (26H2).
- Verify the exact builds and KB articles for each product on the Microsoft Security Update Guide before rollout.
Workaround
Unknown.
- No Microsoft workaround has been identified. The security update is the stated fix.
Exploitation
- No evidence of exploitation in the wild.
- Microsoft rates exploit code maturity as Unproven (E:U).
- No public proof of concept has been found.
- CISA SSVC: exploitation none, not automatable, partial technical impact.
Our recommendation
- Install the November 2026 cumulative update on all affected Windows clients and servers as part of the normal monthly patch cycle.
- Prioritize the Important-rated kernel elevation-of-privilege fixes from the same release, as they pose a greater risk.
- Check the Security Update Guide for the exact fixed build of each product before rollout.
- Focus on shared terminal servers, RDS hosts and multi-user systems where untrusted users or malware may run locally.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – 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)
- KB5131085, KB5131096, KB5131090, KB5131087, KB5132061, KB5132043
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-105552 msrc.microsoft.com
- CVE Record: CVE-2026-105552 www.cve.org
- BleepingComputer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.com
- Strix: CVE-2026-105552 www.strix.ai
- Senserva: KB5131080 update listing senserva.com
- SANS ISC diary archive isc.sans.edu
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, 17:01.
Original description (NVD)
An information disclosure vulnerability exists when the Windows kernel improperly initializes objects in memory. To exploit this vulnerability, an authenticated attacker could run a specially crafted application. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user’s system. The update addresses the vulnerability by correcting how the Windows kernel initializes objects in memory.
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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