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Description

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

PUBLISHED Reserved 2025-12-11 | Published 2026-02-10 | Updated 2026-02-23 | Assigner microsoft




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-122: Heap-based Buffer Overflow

Product status

10.0.26100.0 (custom) before 10.0.26100.7840
affected

10.0.26200.0 (custom) before 10.0.26200.7840
affected

10.0.28000.0 (custom) before 10.0.28000.1575
affected

10.0.28000.0 (custom) before 10.0.28000.1575
affected

10.0.26100.0 (custom) before 10.0.26100.32370
affected

10.0.26100.0 (custom) before 10.0.26100.32370
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21245 (Windows Kernel Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-21245)

nvd.nist.gov (CVE-2026-21245)

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