---
id: "CVE-2026-122984"
page: "https://infrastack.ai/live/CVE-2026-122984"
kind: "vulnerability"
aliases: ["CVE-2026-122984"]
title: "Windows UDF file system driver heap overflow lets local users gain privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows 10/11 and Windows Server", "fixed": ["Nov 2026 cumulative update"], "affected": "Win10 1607 <10.0.14393.9688; 1809 <10.0.17763.9487; 21H2 <10.0.19044.7846; 22H2 <10.0.19045.7846; Win11 23H2 <10.0.22631.7711; 24H2 <10.0.26100.9974; 25H2 <10.0.26200.9974; 26H1 <10.0.28000.3501; 26H2 <10.0.26300.9974; Server 2016 <10.0.14393.9688; 2019 <10.0.17763.9487; 2022 <10.0.20348.5870; 2025 <10.0.26100.33822", "ecosystem": "vendor"}]
ecosystems: []
tags: ["infrastructure", "kernel", "local", "privilege-escalation", "udfs", "windows"]
not_affected_if: ["patched-nov-2026"]
published_at: "2026-11-10T19:20:37+00:00"
first_seen_at: "2026-11-10T19:25:11+00:00"
updated_at: "2026-11-10T21:35:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-122984", "first_seen_at": "2026-11-10T19:25:11+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-122984", "first_seen_at": "2026-11-10T21:35:32+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-122984", "https://app.opencve.io/cve/CVE-2026-122984"]}]
exploit_sources: []
---

# Windows UDF file system driver heap overflow lets local users gain privileges

Link for people: https://infrastack.ai/live/CVE-2026-122984 (this .md is for agents)

Heap-based buffer overflow in the Windows UDFS (Universal Disk Format) kernel driver lets a low-privileged local attacker elevate privileges (CVSS 7.8, no user interaction). Microsoft fixed it in the November 2026 updates. No exploitation or public PoC found.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Windows 10/11 and Windows Server affected Win10 1607 <10.0.14393.9688; 1809 <10.0.17763.9487; 21H2 <10.0.19044.7846; 22H2 <10.0.19045.7846; Win11 23H2 <10.0.22631.7711; 24H2 <10.0.26100.9974; 25H2 <10.0.26200.9974; 26H1 <10.0.28000.3501; 26H2 <10.0.26300.9974; Server 2016 <10.0.14393.9688; 2019 <10.0.17763.9487; 2022 <10.0.20348.5870; 2025 <10.0.26100.33822 fixed Nov 2026 cumulative update

## How to check

Run 'winver' or PowerShell '[System.Environment]::OSVersion.Version' and compare the full build (e.g. 10.0.26100.xxxx) with the fixed build for your Windows version; if lower, you are exposed. Or check that the November 2026 cumulative update (KB listed in the MSRC entry for CVE-2026-122984) is installed with 'Get-HotFix'.

## Fix

Install the November 2026 Windows cumulative update. Fixed builds: Win10 1607/Server 2016 10.0.14393.9688; Win10 1809/Server 2019 10.0.17763.9487; Win10 21H2 10.0.19044.7846; Win10 22H2 10.0.19045.7846; Win11 23H2 10.0.22631.7711; Win11 24H2 10.0.26100.9974; Win11 25H2 10.0.26200.9974; Win11 26H1 10.0.28000.3501; Win11 26H2 10.0.26300.9974; Server 2022 10.0.20348.5870; Server 2025 10.0.26100.33822.

## Timeline

- 2026-11-10T19:25:11+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-122984
- 2026-11-10T21:35:32+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-122984 — MSRC page is JS-only and unreadable; build ranges taken from Microsoft CNA record via NVD/OpenCVE. CVSS 7.8, CVSS temporal E:U (exploit unproven), not KEV. Not marked verified: MSRC page not read.

## Documents

- [advisory] NVD CVE-2026-122984 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/CVE-2026-122984
- [describes] OpenCVE CVE-2026-122984 (CNA build list) https://app.opencve.io/cve/CVE-2026-122984

## From the sources

Heap-based buffer overflow in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to elevate privileges locally.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_