CVE-2025-29974
📋 TL;DR
An integer underflow vulnerability in the Windows Kernel allows attackers on adjacent networks to read kernel memory and potentially disclose sensitive information. This affects Windows systems with vulnerable kernel versions. Attackers must be on the same local network segment as the target.
💻 Affected Systems
- Windows
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Kernel memory disclosure could reveal sensitive data like passwords, encryption keys, or system information that could facilitate further attacks.
Likely Case
Information disclosure of kernel memory contents, potentially revealing system details or partial data that could aid in other attacks.
If Mitigated
Limited impact with proper network segmentation and access controls preventing adjacent network access.
🎯 Exploit Status
Exploitation requires adjacent network access and knowledge of vulnerable kernel structures. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific patch versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29974
Restart Required: Yes
Instructions:
1. Check Microsoft Security Update Guide for affected versions. 2. Apply the latest Windows security updates through Windows Update. 3. Restart the system as required.
🔧 Temporary Workarounds
Network Segmentation
allImplement strict network segmentation to limit adjacent network access to critical systems.
Firewall Rules
allConfigure firewalls to restrict unnecessary network traffic between systems on the same segment.
🧯 If You Can't Patch
- Implement strict network segmentation and access controls
- Monitor for suspicious network activity and kernel memory access attempts
🔍 How to Verify
Check if Vulnerable:
Check Windows version and compare against Microsoft's affected versions list in the advisory.Check Version:
wmic os get versionVerify Fix Applied:
Verify Windows Update history shows the security patch has been applied and system is running patched kernel version.📡 Detection & Monitoring
Log Indicators:
- Unusual kernel memory access patterns
- Network traffic from unexpected adjacent systems
Network Indicators:
- Suspicious network packets targeting kernel interfaces from adjacent systems
SIEM Query:
EventID=4688 OR EventID=4657 with process names indicating kernel access from network sources