CVE-2025-22444: Intel UEFI PdaSmm Disclosure Vulnerability

CVE-2025-22444 Overview

CVE-2025-22444 is a BIOS/UEFI vulnerability affecting the UEFI PdaSmm module in certain Intel reference platforms. The vulnerability involves an exposure of resource to wrong sphere (CWE-668), which may allow an authenticated attacker with elevated privileges to gain unauthorized access to sensitive information through local access.

This vulnerability requires local access and high attack complexity, making exploitation more difficult but still a significant concern for environments where physical access or compromised system software is a possibility. The flaw specifically impacts confidentiality, potentially exposing sensitive data stored or processed by the UEFI firmware.

Critical Impact

Successful exploitation could result in high confidentiality impact, allowing privileged attackers to access sensitive information from the UEFI PdaSmm module on affected Intel reference platforms.

Affected Products

• Intel Reference Platforms with UEFI PdaSmm Module
• Systems using vulnerable Intel UEFI firmware implementations

Discovery Timeline

• 2026-03-10 - CVE-2025-22444 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2025-22444

Vulnerability Analysis

This vulnerability exists within the UEFI PdaSmm (Platform Data Area System Management Mode) module, which operates in System Management Mode (SMM) - a highly privileged execution environment within x86 processors. SMM code runs in a protected memory region called SMRAM and has access to all system resources.

The exposure of resource to wrong sphere weakness (CWE-668) indicates that the PdaSmm module improperly exposes resources or data to code or processes that should not have access to them. In the context of UEFI firmware, this typically means that sensitive information stored in SMRAM or handled by SMM handlers may be accessible to less privileged code.

Exploitation requires a privileged user with system software access and involves high complexity attacks. While no user interaction is required, the attacker must have local access to the target system. The vulnerability does not require special internal knowledge of the system.

Root Cause

The root cause stems from improper resource isolation within the UEFI PdaSmm module. The module fails to properly restrict access to sensitive resources, allowing them to be exposed to unauthorized spheres of execution. This class of vulnerability typically occurs when:

• SMM handlers do not properly validate input parameters before accessing protected memory regions
• Resource boundaries are not adequately enforced between different execution contexts
• Sensitive data is inadvertently exposed through improper memory management or buffer handling

Attack Vector

The attack vector is local, requiring an adversary to have existing privileged access to the target system. The attacker would need to:

1. Gain privileged user access to the target system
2. Execute crafted system software that interacts with the vulnerable UEFI PdaSmm module
3. Trigger the vulnerability to access exposed resources that should be protected

The high attack complexity suggests that specific conditions must be met or multiple steps must be performed to successfully exploit the vulnerability. This is characteristic of UEFI/SMM vulnerabilities where precise timing, memory layout, or specific system states may be required.

For detailed technical information about this vulnerability, refer to the Intel Security Advisory SA-01234.

Detection Methods for CVE-2025-22444

Indicators of Compromise

• Unusual SMI (System Management Interrupt) activity or frequency
• Unexpected access patterns to UEFI/BIOS configuration areas
• Anomalous privileged process behavior targeting firmware interfaces
• Evidence of firmware dump or extraction attempts

Detection Strategies

• Monitor for privileged processes attempting to interact with SMM handlers through unusual SMI triggers
• Implement firmware integrity monitoring to detect unauthorized changes to UEFI modules
• Deploy endpoint detection solutions capable of monitoring low-level system interactions
• Audit privileged user activity for suspicious firmware-related operations

Monitoring Recommendations

• Enable UEFI Secure Boot logging and monitor for validation failures
• Implement hardware security module (HSM) or TPM-based attestation for firmware integrity
• Configure security information and event management (SIEM) alerts for firmware-related activities
• Regularly audit systems for unauthorized firmware modifications using vendor-provided tools

How to Mitigate CVE-2025-22444

Immediate Actions Required

• Review the Intel Security Advisory SA-01234 for specific guidance and updates
• Identify all systems using affected Intel reference platform UEFI implementations
• Restrict physical access to affected systems until patches can be applied
• Limit privileged user access to only essential personnel
• Enable UEFI Secure Boot if not already configured

Patch Information

Intel has released a security advisory addressing this vulnerability. System administrators should consult the Intel Security Advisory SA-01234 for specific patch information and updated firmware versions. Organizations should work with their OEM vendors to obtain applicable BIOS/UEFI firmware updates for their specific hardware platforms.

Workarounds

• Implement strict access controls to limit the number of users with privileged system access
• Enable UEFI Secure Boot to ensure only signed firmware components are executed
• Deploy hardware-based security features such as Intel Boot Guard where available
• Monitor for and restrict access to firmware configuration utilities
• Consider network segmentation to isolate systems that cannot be immediately patched

# Verify Secure Boot status on Linux systems
mokutil --sb-state

# Check UEFI firmware version
dmidecode -t bios | grep -E "(Version|Release Date)"

# Enable additional BIOS password protection via vendor-specific tools
# Consult your OEM documentation for specific configuration steps