EUVD-2026-44293
GHSA-h4rm-wc6r-8xw9
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP needing an existing low-privileged user (AV:L, PR:L), no interaction, with kernel compromise yielding full C/I/A impact and unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Integer overflow or wraparound in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel allows an authenticated attacker to elevate to SYSTEM by triggering an integer overflow (CWE-190) in a kernel code path. The flaw affects a broad range of supported Windows client and server releases (Windows 10 1607 through Windows 11 26H1, and Windows Server 2012 through Server 2025). Reported by Microsoft with a vendor patch available; no public exploit identified at time of analysis and no EPSS or KEV data supplied.
Technical ContextAI
The vulnerability resides in the Windows NT kernel, the privileged core that mediates memory management, process/thread scheduling, and object handling for all user-mode code. CWE-190 (Integer Overflow or Wraparound) means an arithmetic operation - typically a size or length calculation used before a buffer allocation or index computation - exceeds the maximum value of its integer type and wraps, producing an undersized allocation or out-of-bounds access. The associated tags (Buffer Overflow, Integer Overflow) indicate the wrapped value is subsequently used to size or index a kernel buffer, converting an arithmetic error into memory corruption within kernel address space. Because the affected component runs in ring 0, successful corruption yields SYSTEM-level control. The CPE set spans the Windows 10/11 clients and Windows Server 2012-2025 kernels, indicating shared vulnerable kernel code across a long servicing baseline.
RemediationAI
Apply the Microsoft security update for CVE-2026-58532; Patch available per vendor advisory (Microsoft Security Response Center) - consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58532 for the exact patched build number matching each affected OS release, as the input does not enumerate a single fix version. Because the affected code spans many servicing baselines, prioritize the monthly cumulative/rollup update appropriate to each Windows 10/11 and Windows Server 2012-2025 system, including Server Core installations. No vendor-supplied workaround is listed; as compensating controls until patching, restrict local and interactive/RDP logon rights to reduce the pool of low-privileged principals who could run the exploit, enforce least-privilege on multi-user and terminal-server hosts, and use application allowlisting (e.g., WDAC/AppLocker) to hinder delivery of an exploit binary - noting these limit but do not eliminate exposure since any authenticated code-execution foothold could still trigger the flaw. Ensure EDR is enabled to detect anomalous token/privilege changes as a detective backstop.
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today