Microsoft Windows: Information disclosure in Kernel Transaction Manager
Summary
An uninitialized resource in the Windows Kernel Transaction Manager (KTM) can expose information from kernel memory. An attacker needs local access and a valid low-privileged account, and the impact is limited to confidentiality. Multi-user systems such as terminal servers, shared workstations or hosts used by contractors carry the most exposure. Microsoft rates the flaw Important.
Affected
- Windows 10 Version 1607 (below 10.0.14393.9688)
- Windows 10 Version 1809 (below 10.0.17763.9487)
- Windows 10 Version 21H2 (below 10.0.19044.7846)
- Windows 10 Version 22H2 (below 10.0.19045.7846)
- Windows 11 Version 23H2 (below 10.0.22631.7711)
- Windows 11 Version 24H2 (below 10.0.26100.9974)
- Windows 11 Version 25H2 (below 10.0.26200.9974)
- Windows 11 Version 26H1 (below 10.0.28000.3501)
- Windows 11 Version 26H2 (below 10.0.26300.9974)
- Windows Server 2016 incl. Server Core (below 10.0.14393.9688)
- Windows Server 2019 incl. Server Core (below 10.0.17763.9487)
- Windows Server 2022 (below 10.0.20348.5870)
Fixed in
- Windows 11 23H2: KB5131087, build 22631.7711
- Windows 10 22H2: KB5131096, build 19045.7846
- Windows 10 21H2 LTSC: KB5131096, build 19044.7846
- Other affected versions: the November 2026 security update. Confirm the matching KB number and build on the MSRC page.
Workaround
Unknown. No workaround is documented. Install the November 2026 security update.
Exploitation
- No known exploitation in the wild.
- CISA SSVC: exploitation none, not automatable, partial technical impact.
- No public proof of concept found at the time of writing.
Our recommendation
- Install the November 2026 cumulative update on all affected Windows systems through normal monthly patching.
- Prioritise multi-user systems such as terminal servers and shared workstations.
- Confirm the build number of each system against the MSRC page.
- Monitor for changes to exploitation status and for an NVD entry.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – Kernel Transaction Manager
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Response Center advisory CVE-2026-122297 msrc.microsoft.com
- KB5131087 Windows 11 23H2 security update support.microsoft.com
- KB5131096 Windows 10 security update explained www.it-connect.tech
- BleepingComputer: November 2026 Patch Tuesday www.bleepingcomputer.com
- CVE list release cve_2026-11-11_0200Z github.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, 16:41.
Original description (NVD)
Use of uninitialized resource in Kernel Transaction Manager allows an authorized attacker to disclose information locally.
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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