Horizon DataSys Reboot Restore Standard Kernel Driver Memory Corruption Vulnerability (CVE-2026-120232) Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTHorizon DataSys Reboot Restore Standard up to version 13.2
A local attacker can exploit a memory corruption vulnerability in the kernel driver (shield.sys) to execute arbitrary code with SYSTEM privileges and bypass security controls
Restrict access to the vulnerable driver and prepare to apply the official patch once the upcoming release is available
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
A fix is planned for the upcoming release by the vendor. Once released, administrators should deploy the updated version immediately. For automated deployment tools, the following PowerShell command can be used for a silent installation:
# Example of silent installation for the upcoming patched version
Start-Process -FilePath 'RebootRestore_Setup_Updated.exe' -ArgumentList '/s /v"/qn REBOOT=ReallySuppress"' -Wait -NoNewWindow2. Temporary Workaround & Hardening Configuration
Until the official patch is released, restrict access to the shield.sys driver file to prevent unauthorized local users from interacting with the driver.
# Restrict write/modify permissions on shield.sys to prevent tampering
$Path = 'C:\Windows\System32\drivers\shield.sys'
if (Test-Path $Path) {
$Acl = Get-Acl $Path
$Ar = New-Object System.Security.AccessControl.FileSystemAccessRule('Users', 'ReadAndExecute', 'Allow')
$Acl.SetAccessRule($Ar)
Set-Acl $Path $Acl
Write-Host 'Driver file permissions hardened successfully.'
}3. Log Audit & IoC Verification Commands
Use the following script to verify the presence and version of the shield.sys driver on your endpoints.
# Check the presence and version of the shield.sys driver
$DriverPath = 'C:\Windows\System32\drivers\shield.sys'
if (Test-Path $DriverPath) {
$FileInfo = Get-Item $DriverPath
$VersionInfo = [System.Diagnostics.FileVersionInfo]::GetVersionInfo($DriverPath)
Write-Host 'Driver Found:' $DriverPath
Write-Host 'Product Version:' $VersionInfo.ProductVersion
Write-Host 'File Created:' $FileInfo.CreationTime
} else {
Write-Host 'shield.sys driver is not present on this system.'
}Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
A memory corruption vulnerability (CWE-119) has been identified in the kernel driver shield.sys of Horizon DataSys Reboot Restore Standard. The root cause lies within the sub_23908 function, which fails to properly validate input buffers passed from user-mode applications. This lack of validation leads to memory corruption when processing specific requests.
2. Exploitation Mechanics & Attack Scenario
To exploit this vulnerability, an attacker must first obtain local access with low-privilege user credentials on the target system. By sending crafted Input/Output Control (IOCTL) requests to the shield.sys driver, the attacker triggers the vulnerability in the sub_23908 function. This corrupts kernel memory, allowing the attacker to hijack the execution flow and execute arbitrary code with kernel-level (SYSTEM) privileges. Public exploits are currently available, increasing the likelihood of active exploitation.
3. Infrastructure & Business Impact
Reboot Restore Standard is widely deployed in shared environments such as public access PCs, schools, and kiosks to maintain system integrity. Successful exploitation allows local users to completely bypass the restore protection, establish persistence, and compromise the entire operating system, posing a severe threat to organizational security and data confidentiality.
Official Vendor Advisories & References
A vulnerability was identified in Horizon DataSys Reboot Restore Standard up to 13.2. The impacted element is the function sub_23908 in the library shield.sys of the component Kernel Driver. Such manipulation leads to memory corruption. The attack can only be performed from a local environment. The exploit is publicly available and might be used. A fix is planned for the upcoming release.
Frequently Asked SecOps Questions (CVE-2026-120232)
FAQQ1. How critical is CVE-2026-120232 and is it actively exploited in the wild?
CVE-2026-120232 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 0.2%. Organizations running affected versions should prioritize patching based on network exposure.
Q2. Which vendors and products are affected by CVE-2026-120232?
Primary impacted vendors include horizondatasys across reboot_restore_standard. Scope summary: Horizon DataSys Reboot Restore Standard 13.2 and prior versions (specifically affecting shield.sys kernel driver)
Q3. What temporary mitigations or workarounds exist for CVE-2026-120232 before patching?
[Mitigation] Restrict access to the vulnerable driver and prepare to apply the official patch once the upcoming release is available Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2026-120232
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
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