Public proof of conceptFix available

CVE-2026-42980

Q: Is CVE-2026-42980 actively exploited?

A proof-of-concept exploit exists for CVE-2026-42980, but active exploitation has not been confirmed at this time.

Q: What is the CVSS score for CVE-2026-42980?

CVE-2026-42980 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

NT OS Kernel Elevation of Privilege Vulnerability

A public proof of concept exists; no exploitation attested.

Published2026-06-09
WeaknessCWE-122 · CWE-191

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC

2026-06-0917:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-25 15:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-42980?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-42980?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Microsoft windows server 2012

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD
—	= r2	no fix published	NVD

Microsoft windows 10 1607

Branch	Affected	Fixed in	Source
10.0	< 10.0.14393.9234	10.0.14393.9234	NVD

Microsoft windows 10 1809

Branch	Affected	Fixed in	Source
10.0	< 10.0.17763.8880	10.0.17763.8880	NVD

10 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

msrc.microsoft.comVendor Advisory

Detection

read 2026-10-25 00:28 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 2 repositories, unverifiedG4sp4rCS/CVE-2026-42980-POCZeroDayEvil/CVE-2026-42980-PoC

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionpoc2026-07-23
OpenCVESSVC decisionpoc—
CNACVSS 3.17.8read 2026-10-23
CNAweakness (CWE)CWE-122, CWE-191read 2026-10-23
FIRST EPSSEPSS score6.9 %2026-10-25
PoC-in-GitHubproof of concept2read 2026-10-25
Microsoft MSRCadvisory—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2026-06-09
Last Modified: 2026-07-29
NVD status: Analyzed
MSRC Title: NT OS Kernel Elevation of Privilege Vulnerability

Frequently asked questions

What is CVE-2026-42980?

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

Is CVE-2026-42980 actively exploited?

A proof-of-concept exploit exists for CVE-2026-42980, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-42980?

CVE-2026-42980 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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