Windows SCSI Class System File: Elevation of privilege via NULL pointer dereference
Summary
A NULL pointer dereference in the Windows SCSI Class System File component allows an authorized local user with low privileges to elevate their privileges to a higher level. The attacker needs local access and an existing low-privileged account or foothold, and no user interaction is required. Microsoft rates the CVSS score as 7.0 (HIGH).
Affected
- Windows 10 Version 1607 (builds before 10.0.14393.9688)
- Windows 10 Version 1809 (builds before 10.0.17763.9487)
- Windows 10 Version 21H2 (builds before 10.0.19044.7846)
- Windows 10 Version 22H2 (builds before 10.0.19045.7846)
- Windows 11 Version 23H2 (builds before 10.0.22631.7711)
- Windows 11 Version 24H2 (builds before 10.0.26100.9974)
- Windows 11 Version 25H2 (builds before 10.0.26200.9974)
- Windows 11 Version 26H1 (builds before 10.0.28000.3501)
- Windows 11 Version 26H2 (builds before 10.0.26300.9974)
- Windows Server 2016, including Server Core (builds before 10.0.14393.9688)
- Windows Server 2019, including Server Core (builds before 10.0.17763.9487)
- Windows Server 2022 (builds before 10.0.20348.5870)
Fixed in
- Fixed in the Microsoft update release of 10 November 2026, with the builds listed above as the first fixed versions per the CVE record.
- Specific KB article numbers: Unknown.
Workaround
Unknown. No vendor-published workaround or mitigation was found.
Exploitation
- Microsoft rates exploit code maturity as Unproven at publication, so no known exploit code exists at that time.
- CISA SSVC: exploitation none, not automatable, total technical impact.
- No evidence of exploitation in the wild or public proof-of-concept code was found at the time of research.
Our recommendation
- Install the November 2026 security update on all affected Windows clients and servers, prioritising multi-user systems, shared PCs, and Remote Desktop or terminal servers.
- Check the MSRC product table for the status of editions not confirmed in this entry.
- Limit local logon rights and remove unneeded accounts to reduce the chance of an attacker gaining a low-privileged foothold.
- Monitor for signs of privilege escalation and recheck CISA KEV and the vendor page for changes.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Microsoft Windows SCSI Class System File
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5132061, KB5132043, KB5131080, KB5131077, KB5132059, KB5131291
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Response Center: CVE-2026-105586 msrc.microsoft.com
- CVE Record: CVE-2026-105586 www.cve.org
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, 09:33.
Original description (NVD)
Null pointer dereference in Microsoft Windows SCSI Class System File allows an authorized attacker to elevate privileges 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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