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High severity7.8NVD Advisory· Published Feb 10, 2026· Updated Jun 17, 2026

CVE-2026-21245

CVE-2026-21245

Description

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

Affected products

11
  • Microsoft/Windows 11 24h23 versions
    cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*+ 2 more
    • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*range: <10.0.26100.7781
    • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*range: <10.0.26100.7781
    • (no CPE)range: 10.0.26100.0
  • Microsoft/Windows 11 25h23 versions
    cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*+ 2 more
    • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*range: <10.0.26200.7781
    • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*range: <10.0.26200.7781
    • (no CPE)range: 10.0.26200.0
  • Microsoft/Windows Server 20252 versions
    cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*range: <10.0.26100.32313
    • (no CPE)range: 10.0.26100.0
  • Microsoft/Windows Kernelllm-fuzzy
  • Microsoft/Windows 11 26h1cpe-rescue
    Range: 10.0.28000.0
  • Microsoft/Windows Server 2025 (Server Core installation)v5
    Range: 10.0.26100.0

Patches

Vulnerability mechanics

References

1

News mentions

0

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