CVE-2024-38106: Windows Kernel Privilege Escalation Flaw

CVE-2024-38106 Overview

CVE-2024-38106 is a Windows Kernel elevation of privilege vulnerability affecting multiple supported versions of Windows 10, Windows 11, and Windows Server. The flaw resides in the Windows kernel and allows a local, authenticated attacker to gain SYSTEM-level privileges after winning a race condition. Microsoft published the advisory on August 13, 2024, and CISA added the issue to the Known Exploited Vulnerabilities (KEV) catalog after confirming in-the-wild abuse. The weakness is classified under [CWE-591] (Sensitive Data Storage in Improperly Locked Memory).

Critical Impact
Successful exploitation grants attackers SYSTEM privileges on Windows endpoints and servers, enabling full host compromise, credential theft, and lateral movement. Active exploitation has been confirmed by CISA.

Affected Products

Microsoft Windows 10 (1507, 1607, 1809, 21H2, 22H2)
Microsoft Windows 11 (21H2, 22H2, 23H2, 24H2)
Microsoft Windows Server 2016, 2019, 2022, and 2022 23H2

Discovery Timeline

2024-08-13 - CVE-2024-38106 published to NVD with Microsoft's security advisory
2025-10-28 - Last updated in NVD database

Technical Details for CVE-2024-38106

Vulnerability Analysis

The vulnerability is an elevation of privilege flaw in the Windows kernel. An authenticated local attacker can abuse improper handling of kernel memory state to elevate from a low-privileged user context to SYSTEM. According to Microsoft, exploitation requires winning a race condition, which raises attack complexity but does not prevent reliable exploitation by skilled adversaries. The CWE classification [CWE-591] indicates that sensitive kernel data is stored in memory that is not properly locked, allowing concurrent access to corrupt state.

The flaw delivers high impact across confidentiality, integrity, and availability because SYSTEM privileges grant unrestricted access to the kernel and protected resources. Attackers commonly chain such bugs with initial-access vectors like phishing payloads or browser exploits to achieve full host takeover.

Root Cause

The root cause stems from improper synchronization in a kernel code path that manages privileged data. Because the affected memory region is not locked during sensitive operations, a parallel thread can observe or modify state during a small window of execution. This creates a time-of-check to time-of-use (TOCTOU) condition that, when successfully raced, allows an attacker-controlled value to influence kernel decisions related to privilege handling.

Attack Vector

Exploitation requires local code execution as a standard user. The attacker spawns racing threads that repeatedly trigger the vulnerable kernel routine while manipulating the unlocked data structure from user mode. After winning the race, the attacker obtains SYSTEM token impersonation or arbitrary kernel write primitives. No user interaction is required beyond initial access to the system. Refer to the Microsoft Security Update for vendor-specific technical detail.

Detection Methods for CVE-2024-38106

Indicators of Compromise

Unexpected processes running with SYSTEM token after launching from a standard user context
Crash dumps or bugchecks originating from the Windows kernel shortly before privilege changes
Newly created services, scheduled tasks, or drivers immediately following the suspect process activity
Anomalous handle duplication or token manipulation events in Windows Security event logs

Detection Strategies

Hunt for token impersonation patterns where a non-elevated parent process spawns a SYSTEM-level child
Monitor Windows Event ID 4672 (special privileges assigned) tied to unusual user accounts
Correlate kernel bugcheck telemetry with subsequent process creation chains
Apply behavioral analytics that flag race-condition exploitation patterns such as rapid repeated syscalls against the same kernel object

Monitoring Recommendations

Centralize endpoint and kernel telemetry into a SIEM or data lake for cross-host correlation
Track patch state across all Windows 10, Windows 11, and Windows Server endpoints in scope
Alert on first-seen drivers, services, or registry persistence following privilege changes
Review CISA KEV catalog updates to validate that compensating controls remain aligned with active exploitation reports

How to Mitigate CVE-2024-38106

Immediate Actions Required

Apply the August 2024 Microsoft security updates to all affected Windows 10, Windows 11, and Windows Server systems
Prioritize patching for internet-exposed servers, multi-user systems, and developer workstations where local code execution is more likely
Audit local user accounts and remove unnecessary interactive logon rights
Validate that endpoint protection and logging are active on every host before and after patch deployment

Patch Information

Microsoft addressed CVE-2024-38106 in the August 2024 Patch Tuesday release. Administrators should consult the Microsoft Security Update Guide for the specific KB article matching each Windows build. Confirmation of in-the-wild exploitation is documented in the CISA Known Exploited Vulnerabilities Catalog.

Workarounds

No official workaround exists; patching is the only supported remediation
Restrict local logon and code execution rights for non-administrative users to reduce exposure
Enforce application control policies such as Windows Defender Application Control (WDAC) to block unapproved binaries
Isolate unpatched legacy systems on segmented network zones until updates are applied

bash

# Verify installed updates on a Windows host
wmic qfe list brief /format:table

# PowerShell: list hotfixes installed after August 2024 Patch Tuesday
Get-HotFix | Where-Object { $_.InstalledOn -ge [datetime]'2024-08-13' } | Sort-Object InstalledOn -Descending