CVE-2026-21245

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Score

CVSS 3.1 7.8 High

Status

Analyzed - secure@microsoft.com

Published

2026-02-10

Last modified

2026-08-19

Weaknesses

CWE-122, CWE-787

Affected products

• Windows 11 24H2 (Microsoft)
• Windows 11 24h2 (Microsoft)
• Windows 11 25H2 (Microsoft)
• Windows 11 25h2 (Microsoft)
• Windows 11 26H1 (Microsoft)
• Windows Server 2025 (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21245