Vulnerability Description
Use after free in Windows Kernel allows an unauthorized attacker to elevate privileges locally.
CVSS Score
9.3
CRITICAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 1607 | < 10.0.14393.9339 |
| Microsoft | Windows 10 1809 | < 10.0.17763.9020 |
| Microsoft | Windows 10 21H2 | < 10.0.19044.7548 |
| Microsoft | Windows 10 22H2 | < 10.0.19045.7548 |
| Microsoft | Windows 11 24H2 | < 10.0.26100.8875 |
| Microsoft | Windows 11 25H2 | < 10.0.26200.8875 |
| Microsoft | Windows 11 26H1 | < 10.0.28000.2269 |
| Microsoft | Windows Server 2012 | - |
| Microsoft | Windows Server 2016 | < 10.0.14393.9339 |
| Microsoft | Windows Server 2019 | < 10.0.17763.9020 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5386 |
| Microsoft | Windows Server 2025 | < 10.0.26100.33158 |
Related Weaknesses (CWE)
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49798PatchVendor Advisory
FAQ
What is CVE-2026-49798?
CVE-2026-49798 is a vulnerability with a CVSS score of 9.3 (CRITICAL). Use after free in Windows Kernel allows an unauthorized attacker to elevate privileges locally.
How severe is CVE-2026-49798?
CVE-2026-49798 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-49798?
Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21H2, Microsoft Windows 10 22H2, Microsoft Windows 11 24H2.