EUVD-2026-56623
GHSA-3cvp-v335-3762
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack requiring a low-privileged account; heap overflow is straightforward with no interaction needed; full system compromise but no scope change since exploitation is kernel-contained on the local host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows USB Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in the Windows USB Driver (CWE-122) affects a broad range of Microsoft Windows client and server platforms, from Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. An authenticated local attacker with low privileges can exploit this kernel-mode heap corruption to achieve full system compromise - gaining complete confidentiality, integrity, and availability over the affected host. Microsoft has released patches across all affected versions via the MSRC advisory; no public exploit has been identified at time of analysis.
Technical ContextAI
CWE-122 (Heap-based Buffer Overflow) describes a memory safety flaw where data is written beyond the allocated bounds of a heap buffer, enabling an attacker to corrupt adjacent heap metadata or function pointers. The affected component is the Windows USB driver stack, a kernel-mode component present and active by default on all Windows installations to support USB device enumeration and I/O control. Because this driver operates in kernel space, successful exploitation can overwrite security-sensitive structures and allow arbitrary code execution at SYSTEM privilege. The CVSS vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H confirms a local attack path requiring only a low-privileged interactive session, with no complexity or user interaction barriers. Affected CPE ranges span Windows 6.2.x (Server 2012) through 10.0.28000.x (Windows 11 26H1), indicating the vulnerable driver code is pervasive across the Windows kernel lineage. The unchanged scope (S:U) means exploitation is contained to the vulnerable host but results in full system-level compromise.
RemediationAI
The primary remediation is to apply the vendor-released patches published by Microsoft via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61926. Exact fixed builds per platform are: Windows Server 2025 to 10.0.26100.33296 or later, Windows 11 24H2 to 10.0.26100.9168 or later, Windows 11 25H2 to 10.0.26200.9168 or later, Windows 11 26H1 to 10.0.28000.2704 or later, Windows 11 23H2 to 10.0.22631.7517 or later, Windows 10 22H2 and 21H2 to 10.0.19045.7663 or 10.0.19044.7663 or later, Windows 10 1809 and Server 2019 to 10.0.17763.9115 or later, Windows Server 2022 to 10.0.20348.5499 or later, Windows Server 2016 and Windows 10 1607 to 10.0.14393.9418 or later, and Windows Server 2012 and 2012 R2 to 6.2.9200.26279 or 6.3.9600.23337 or later respectively. For systems where immediate patching is not feasible, a meaningful compensating control is to enforce application control policies (e.g., Windows Defender Application Control) to block untrusted local executables from running, thereby denying adversaries the low-privilege foothold required to trigger the USB driver path; note this does not eliminate the vulnerability and will not stop insider threats or already-compromised accounts. Restricting physical and logical USB device access via Group Policy (Device Installation Restrictions) reduces the driver attack surface but may impact legitimate USB workflows.
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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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