CVE-2026-42980 NT OS Kernel Elevation of Privilege Vulnerability
An integer underflow in the Windows NT kernel allows a local attacker to elevate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42980?
CVE-2026-42980 is a high-severity vulnerability in Microsoft Windows 10 1607, published on 9 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Integer underflow (wrap or wraparound) in Windows NT OS Kernel allows an authorized attacker to elevate privileges locally.
Which versions are affected by CVE-2026-42980?
It affects 13 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2 and 7 more.
How do I fix CVE-2026-42980?
No fix has been published for CVE-2026-42980 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-42980 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42980 exists.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-jh49-99q5-mwf2.