---
id: CVE-2026-42980
title: >-
  Integer underflow (wrap or wraparound) in Windows NT OS Kernel allows an
  authorized attacker to elevate privileges locally.
summary: >-
  Integer underflow (wrap or wraparound) in Windows NT OS Kernel allows an
  authorized attacker to elevate privileges locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
  - CWE-191
vendor: microsoft
product: windows_10_1607
affected:
  - windows_10_1607 < 10.0.14393.9234
  - windows_10_1809 < 10.0.17763.8880
  - windows_10_21h2 < 10.0.19044.7417
  - windows_10_22h2 < 10.0.19045.7417
  - windows_11_23h2 < 10.0.22631.7219
  - windows_11_24h2 < 10.0.26100.8655
  - windows_11_25h2 < 10.0.26200.8655
  - windows_11_26h1 < 10.0.28000.2269
  - windows_server_2012
  - windows_server_2012 = r2
  - windows_server_2016 < 10.0.14393.9234
  - windows_server_2019 < 10.0.17763.8880
  - windows_server_2022 < 10.0.20348.5256
  - windows_server_2025 < 10.0.26100.32995
patched:
  - windows_10_1607 10.0.14393.9234
  - windows_10_1809 10.0.17763.8880
  - windows_10_21h2 10.0.19044.7417
  - windows_10_22h2 10.0.19045.7417
  - windows_11_23h2 10.0.22631.7219
  - windows_11_24h2 10.0.26100.8655
  - windows_11_25h2 10.0.26200.8655
  - windows_11_26h1 10.0.28000.2269
  - windows_server_2016 10.0.14393.9234
  - windows_server_2019 10.0.17763.8880
  - windows_server_2022 10.0.20348.5256
  - windows_server_2025 10.0.26100.32995
published: '2026-06-09'
updated: '2026-07-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42980'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42980'
    label: secure@microsoft.com
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.06949
epssPercentile: 0.93829
ingestedAt: '2026-07-29T20:50:14.634Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/G4sp4rCS/CVE-2026-42980-POC'
  checkedAt: '2026-09-24T07:53:03.504Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-23T03:55:33.489990Z'
---

## Overview

Integer underflow (wrap or wraparound) in Windows NT OS Kernel allows an authorized attacker to elevate privileges locally.

## Affected

- `windows_10_1607 < 10.0.14393.9234`
- `windows_10_1809 < 10.0.17763.8880`
- `windows_10_21h2 < 10.0.19044.7417`
- `windows_10_22h2 < 10.0.19045.7417`
- `windows_11_23h2 < 10.0.22631.7219`
- `windows_11_24h2 < 10.0.26100.8655`
- `windows_11_25h2 < 10.0.26200.8655`
- `windows_11_26h1 < 10.0.28000.2269`
- `windows_server_2012`
- `windows_server_2012 = r2`
- `windows_server_2016 < 10.0.14393.9234`
- `windows_server_2019 < 10.0.17763.8880`
- `windows_server_2022 < 10.0.20348.5256`
- `windows_server_2025 < 10.0.26100.32995`

## Remediation

Upgrade past the affected range:

- `windows_10_1607 10.0.14393.9234`
- `windows_10_1809 10.0.17763.8880`
- `windows_10_21h2 10.0.19044.7417`
- `windows_10_22h2 10.0.19045.7417`
- `windows_11_23h2 10.0.22631.7219`
- `windows_11_24h2 10.0.26100.8655`
- `windows_11_25h2 10.0.26200.8655`
- `windows_11_26h1 10.0.28000.2269`
- `windows_server_2016 10.0.14393.9234`
- `windows_server_2019 10.0.17763.8880`
- `windows_server_2022 10.0.20348.5256`
- `windows_server_2025 10.0.26100.32995`