---
id: "CVE-2026-95979"
page: "https://infrastack.ai/live/CVE-2026-95979"
kind: "vulnerability"
aliases: ["CVE-2026-95979"]
title: "Windows: use-after-free in file brokering lets a local user gain privileges"
severity: "high"
cvss: 7.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["bfs.sys", "infrastructure", "local-privilege-escalation", "windows"]
not_affected_if: []
published_at: "2026-11-10T19:21:54+00:00"
first_seen_at: "2026-11-10T19:25:26+00:00"
updated_at: "2026-11-10T20:15:47+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-95979", "first_seen_at": "2026-11-10T19:25:26+00:00"}, {"source": "analyst", "url": "https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-95979", "first_seen_at": "2026-11-10T20:15:47+00:00", "cites": ["https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-95979"]}]
exploit_sources: []
---

# Windows: use-after-free in file brokering lets a local user gain privileges

Link for people: https://infrastack.ai/live/CVE-2026-95979 (this .md is for agents)

A use-after-free in the Windows Brokering File System (bfs.sys) lets a locally authenticated user gain higher privileges. Microsoft lists it in the November 2026 security updates, released 2026-11-10. I could not read the affected builds or KB numbers from MSRC. No exploitation or public PoC found.

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

## How to check

Check that the November 2026 cumulative update is installed (Settings > Windows Update > Update history, or PowerShell Get-HotFix). Match the KB to the one listed for your Windows version in the MSRC Update Guide entry for CVE-2026-95979.

## Fix

Install the November 2026 (2026-11-10) Windows cumulative security update. The exact KB and build numbers are unknown; see the MSRC Update Guide entry for CVE-2026-95979.

## Timeline

- 2026-11-10T19:25:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-95979
- 2026-11-10T20:15:47+00:00 analyst https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-95979 — MSRC API index lists the CVE in the November 2026 Security Updates (released 2026-11-10). The MSRC UI page and the CVRF document returned no content, so affected builds and KB numbers are not confirmed. Not verified; no exploitation or PoC found. Related bfs.sys UAF write-ups cover other CVEs.

## Documents

- [advisory] MSRC CVRF update index for CVE-2026-95979 (November 2026 Security Updates) https://api.msrc.microsoft.com/cvrf/v3.0/updates/CVE-2026-95979

## From the sources

Use after free in Windows Brokering File System allows an authorized attacker to elevate privileges locally.

---

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