Microsoft Windows: Local privilege escalation in Redirected Drive Buffering
Summary
A heap-based buffer overflow in the Windows Redirected Drive Buffering System allows an authorized local user to elevate privileges. An attacker with a low-privileged account on the affected system could gain higher rights, potentially up to SYSTEM. Exploitation requires local access and valid credentials, so the risk is highest on multi-user systems such as Remote Desktop session hosts and file servers.
Affected
- Windows 10 Version 1607 and Windows Server 2016 (incl. Server Core): 10.0.14393.0 before 10.0.14393.9688
- Windows 10 Version 1809 and Windows Server 2019 (incl. Server Core): 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 2022: 10.0.20348.0 before 10.0.20348.5870
- Windows Server 2025: Unknown (not listed in the official CVE record)
Fixed in
- Install the November 2026 cumulative update from Microsoft for each affected Windows version. Builds at or above the listed fixed versions are patched.
Workaround
Unknown.
Exploitation
- No evidence of exploitation in the wild was found.
- Not listed in the CISA Known Exploited Vulnerabilities catalog.
- CISA SSVC: exploitation none, not automatable, total technical impact.
- No public proof of concept was found; this should be treated as unknown rather than absent.
Our recommendation
- Apply the November 2026 cumulative update in the normal monthly patch cycle, prioritising Remote Desktop session hosts and file servers.
- Verify the exact fixed build per system against the MSRC advisory before rollout.
- Restrict local logon and limit shared or terminal server use to trusted accounts.
- Monitor for unusual privilege escalation or new SYSTEM-level processes on critical hosts.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Redirected Drive Buffering
- 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 Update Guide: CVE-2026-108412 msrc.microsoft.com
- CVE.org record CVE-2026-108412 www.cve.org
- Strix AI: CVE-2026-108412 (secondary, build list unverified) www.strix.ai
- Newsbeep: Patch Tuesday coverage (secondary) www.newsbeep.com
- Rapid7: Patch Tuesday July 2026 (related component advisories) www.rapid7.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, 04:25.
Original description (NVD)
Heap-based buffer overflow in Windows Redirected Drive Buffering 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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.