CVE-2026-24293
📋 TL;DR
This vulnerability is a null pointer dereference in Windows Ancillary Function Driver for WinSock that allows an authenticated attacker to execute arbitrary code with elevated privileges on the local system. It affects Windows systems with the vulnerable driver component. Attackers must already have some level of access to the system to exploit this flaw.
💻 Affected Systems
- Microsoft Windows
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM-level privileges, allowing attackers to install malware, steal credentials, modify system configurations, and maintain persistent access.
Likely Case
Privilege escalation from standard user to administrator/SYSTEM privileges, enabling lateral movement, data theft, and further system manipulation.
If Mitigated
Limited impact with proper privilege separation, application control policies, and endpoint protection that detects privilege escalation attempts.
🎯 Exploit Status
Exploitation requires understanding of Windows kernel memory management and driver interactions. The attacker must already have user-level access to the system.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-24293
Restart Required: Yes
Instructions:
1. Open Windows Update Settings
2. Click 'Check for updates'
3. Install all available security updates
4. Restart the system when prompted
🔧 Temporary Workarounds
Restrict user privileges
windowsImplement least privilege principle to limit the impact of successful exploitation
Enable exploit protection
windowsUse Windows Defender Exploit Guard or similar solutions to detect and block privilege escalation attempts
🧯 If You Can't Patch
- Implement strict network segmentation to limit lateral movement
- Deploy endpoint detection and response (EDR) solutions to monitor for privilege escalation behavior
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for the specific security patch or use Microsoft's Security Update Guide with your system versionCheck Version:
wmic os get caption, version, buildnumberVerify Fix Applied:
Verify the security update is installed via Windows Update history or by checking system version against patched versions📡 Detection & Monitoring
Log Indicators:
- Unusual process creation with elevated privileges
- Suspicious driver loading or modification
- Security event 4688 with elevated token
Network Indicators:
- Lateral movement attempts following local privilege escalation
SIEM Query:
EventID=4688 AND NewProcessName CONTAINS 'cmd.exe' AND SubjectLogonId!=0x3e7 AND TokenElevationType='%%1938'