CVE-2025-47335: Buffer Overflow Vulnerability

CVE-2025-47335 Overview

CVE-2025-47335 is a memory corruption vulnerability that occurs while parsing clock configuration data for a specific hardware type. This buffer overflow vulnerability (CWE-120: Buffer Copy without Checking Size of Input) can be exploited by a local attacker with high privileges to achieve unauthorized access to confidential information, modify system data, or cause system instability.

Critical Impact

Local attackers with elevated privileges can exploit this memory corruption flaw to compromise confidentiality, integrity, and availability of affected Qualcomm chipset systems.

Affected Products

• Qualcomm chipsets with clock configuration parsing functionality
• Devices utilizing affected firmware versions
• Systems processing hardware-specific clock configuration data

Discovery Timeline

• 2026-01-07 - CVE CVE-2025-47335 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-47335

Vulnerability Analysis

This vulnerability stems from a classic buffer overflow condition (CWE-120) in the clock configuration parsing component. When the affected system processes clock configuration data for a specific hardware type, it fails to properly validate the size of input data before copying it to a fixed-size buffer. This oversight allows an attacker with local access and high privileges to supply maliciously crafted configuration data that exceeds the expected buffer boundaries.

The exploitation requires local access and high privileges, which limits the attack surface but increases the potential impact once exploited. A successful attack can result in complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause is a buffer copy operation that does not verify the size of input data before writing to a destination buffer (CWE-120). During clock configuration parsing, the system accepts configuration data without proper bounds checking, allowing oversized input to overflow the allocated memory region. This classic memory safety issue enables attackers to overwrite adjacent memory areas, potentially corrupting critical data structures or control flow information.

Attack Vector

The attack vector is local, requiring the attacker to have direct access to the vulnerable system with high privileges. The attacker must be able to influence or supply clock configuration data that will be processed by the vulnerable parsing routine. The attack complexity is low, meaning no special conditions or circumstances are required beyond the initial access requirements. No user interaction is needed for exploitation, and the scope is unchanged, meaning the vulnerable component and impacted component remain the same.

The exploitation mechanism involves supplying clock configuration data larger than the expected buffer size, causing memory corruption when the data is copied without size validation. This can lead to code execution, privilege escalation within the affected component, or denial of service conditions.

Detection Methods for CVE-2025-47335

Indicators of Compromise

• Unexpected system crashes or reboots during clock configuration operations
• Anomalous memory access patterns in kernel or firmware logs
• Unusual clock-related error messages in system logs
• Signs of memory corruption in system diagnostics

Detection Strategies

• Monitor for abnormal clock configuration parsing activities on affected Qualcomm devices
• Implement memory integrity monitoring to detect buffer overflow attempts
• Review system logs for clock configuration errors or unexpected firmware behavior
• Deploy endpoint detection solutions capable of identifying memory corruption patterns

Monitoring Recommendations

• Enable detailed logging for firmware and kernel-level operations
• Implement runtime memory protection mechanisms where supported
• Monitor for privilege escalation attempts following clock configuration activities
• Establish baselines for normal clock configuration behavior to identify anomalies

How to Mitigate CVE-2025-47335

Immediate Actions Required

• Review the Qualcomm January 2026 Security Bulletin for specific patch information
• Identify all devices in your environment running affected Qualcomm chipsets
• Prioritize patching based on exposure and criticality of affected systems
• Restrict local access to affected devices to trusted administrators only

Patch Information

Qualcomm has addressed this vulnerability in their January 2026 Security Bulletin. Organizations should consult the official security bulletin for detailed patch information, affected chipset models, and firmware update procedures. Device manufacturers may need to integrate Qualcomm's patches into their device-specific firmware updates before distribution to end users.

Workarounds

• Limit local access to affected systems to only essential personnel with verified high-privilege requirements
• Implement additional access controls to restrict who can modify clock configuration data
• Monitor affected systems closely for signs of exploitation until patches can be applied
• Consider network segmentation to isolate affected devices from critical infrastructure

# Verify firmware version on affected devices
# Consult vendor documentation for device-specific commands
# Example: Check current firmware version and compare against patched versions
# listed in Qualcomm January 2026 Security Bulletin