EUVD-2026-44006
GHSA-jj2c-679g-wvqh
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Physical access is the mandatory prerequisite per description and CVSS; no authentication or user interaction needed; full C/I/A reflects kernel-level SYSTEM privilege escalation with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Kernel allows an unauthorized attacker to elevate privileges with a physical attack.
AnalysisAI
Heap-based buffer overflow in the Windows Kernel (CWE-122) enables an unauthenticated attacker with physical access to escalate privileges to SYSTEM level across a broad range of Windows 10, Windows 11, and Windows Server editions. The physical attack vector (AV:P) constrains the threat surface significantly, and SSVC rates exploitation as none with no public exploit identified at time of analysis. Despite total technical impact potential confirmed by both CVSS C:H/I:H/A:H metrics and SSVC technical impact rating, real-world risk is concentrated in physically accessible deployment scenarios such as kiosks, field laptops, or shared terminals.
Technical ContextAI
The vulnerability resides in the Windows NT Kernel - the privileged core shared across all modern Microsoft Windows operating systems. CWE-122 (Heap-based Buffer Overflow) identifies the root cause as improper bounds checking during heap memory allocation or copy operations within a kernel-mode code path. When triggered, an attacker can write data beyond the allocated heap buffer boundary, corrupting adjacent kernel memory structures such as object headers or security tokens. Because this occurs in kernel space, successful exploitation bypasses user-mode privilege boundaries entirely. CPE data confirms the flaw spans consumer and enterprise Windows lines: Windows 10 versions 1607 through 22H2, Windows 11 versions 24H2 through 26H1, and Windows Server 2016 and 2019 (including Server Core installations). The physical attack vector (AV:P) implies the trigger mechanism requires direct hardware interaction - likely a malicious USB, Thunderbolt, or PCIe-attached device capable of sending crafted input or performing direct memory access (DMA) to reach the vulnerable kernel code path.
RemediationAI
Apply the Microsoft-released cumulative update targeting the fixed build versions confirmed via ENISA EUVD-2026-44006: update Windows Server 2016 and Windows 10 1607 systems to build 10.0.14393.9339 or later; Windows Server 2019 and Windows 10 1809 to 10.0.17763.9020 or later; Windows 10 21H2 to 10.0.19044.7548 or later; Windows 10 22H2 to 10.0.19045.7548 or later; Windows 11 24H2 to 10.0.26100.8875 or later; Windows 11 25H2 to 10.0.26200.8875 or later; and Windows 11 26H1 to 10.0.28000.2269 or later. Full advisory and update packages are available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54132. For systems where immediate patching is not feasible, enforce physical security controls as the primary compensating measure: restrict unescorted physical access to affected machines, enable BitLocker with TPM binding to reduce DMA-based attack surface, and enforce Secure Boot to harden against boot-time hardware exploitation. Disabling unused physical ports (USB, Thunderbolt, PCIe) via BIOS/UEFI Group Policy can further reduce attack surface, though this impacts peripheral use and must be evaluated per device role.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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