Vulnerability · Published Jun 9, 2026 · Assigned by microsoft
CVE-2026-42980NT OS Kernel Elevation of Privilege Vulnerability
High 7.8
In plain English
A high-severity heap buffer overflow in Windows 10 Version 1607 from Microsoft. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 6.9% (higher than 94% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)6.9%top 5.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC
Official description
Integer underflow (wrap or wraparound) in Windows NT OS Kernel allows an authorized attacker to elevate privileges locally.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 – before 10.0.14393.9234 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – before 10.0.17763.8880 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 – before 10.0.19044.7417 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 – before 10.0.19045.7417 |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 – before 10.0.22631.7219 |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 – before 10.0.22631.7219 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – before 10.0.26100.8655 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – before 10.0.26200.8655 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – before 10.0.28000.2269 |
| Microsoft | Windows Server 2012 | 6.2.9200.0 – before 6.2.9200.26132 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 – before 6.2.9200.26132 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 – before 6.3.9600.23228 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 – before 6.3.9600.23228 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – before 10.0.14393.9234 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – before 10.0.14393.9234 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – before 10.0.17763.8880 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – before 10.0.17763.8880 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – before 10.0.20348.5256 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – before 10.0.26100.32995 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – before 10.0.26100.32995 |
Weakness: CWE-191, CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- NT OS Kernel Elevation of Privilege Vulnerability vendor-advisory, patch