Heap-based Buffer Overflow in Windows Kernel by Microsoft
CVE-2026-21245

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2025 (server Core Installation)
Windows 11 Version 25h2
Windows 11 Version 24h2
Windows Server 2025
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21245?

A heap-based buffer overflow vulnerability in the Windows Kernel allows an authorized attacker to manipulate the system in order to elevate user privileges locally. This flaw can potentially give attackers more control over the operating system, making it crucial for users and administrators to apply available patches to safeguard against exploitation.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.7840

Windows 11 Version 25H2 10.0.26200.0 < 10.0.26200.7840

Windows 11 Version 26H1 10.0.28000.0 < 10.0.28000.1575

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
.