CVE-2025-47394: Buffer Overflow Vulnerability

CVE-2025-47394 Overview

CVE-2025-47394 is a memory corruption vulnerability that occurs when copying overlapping buffers during memory operations due to incorrect offset calculations. This buffer overflow vulnerability (CWE-120) affects Qualcomm components and can lead to significant security impact through local exploitation.

Critical Impact

Local attackers with low privileges can exploit this memory corruption vulnerability to achieve high impact on confidentiality, integrity, and availability of affected systems.

Affected Products

• Qualcomm chipset components (refer to the Qualcomm January 2026 Security Bulletin for complete list)

Discovery Timeline

• 2026-01-07 - CVE-2025-47394 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-47394

Vulnerability Analysis

This vulnerability stems from a classic buffer overflow condition (CWE-120: Buffer Copy without Checking Size of Input) that manifests during memory copy operations involving overlapping buffers. The core issue lies in incorrect offset calculations when the source and destination memory regions overlap, leading to memory corruption.

When exploited, this vulnerability allows an attacker with local access and low privileges to potentially corrupt adjacent memory regions. The impact is significant across all three security dimensions—attackers could read sensitive data from memory (confidentiality breach), modify critical data structures (integrity violation), or cause system instability (availability impact).

Root Cause

The root cause is an improper implementation of buffer copy operations that fails to correctly handle scenarios where source and destination buffers overlap. The offset calculations used during the copy operation do not account for all edge cases of memory overlap, resulting in data being written to unintended memory locations. This is a classic buffer overflow pattern where input size validation is insufficient or absent.

Attack Vector

This vulnerability requires local access to exploit. An attacker with low-privilege access to the system can trigger the vulnerable code path by initiating memory operations with specially crafted overlapping buffer configurations. The attack does not require user interaction and operates within unchanged scope boundaries, meaning the vulnerability's impact is contained to the vulnerable component's authorization scope.

The exploitation mechanism involves:

1. Identifying memory operations that utilize the vulnerable buffer copy routine
2. Crafting input that creates overlapping source and destination buffers
3. Triggering the copy operation with offset calculations that cause memory corruption
4. Leveraging the corrupted memory state to achieve code execution or privilege escalation

Detection Methods for CVE-2025-47394

Indicators of Compromise

• Unexpected system crashes or kernel panics in Qualcomm-related drivers or components
• Memory access violations or segmentation faults in affected software modules
• Abnormal memory allocation patterns or heap corruption signatures
• Application instability following specific memory-intensive operations

Detection Strategies

• Deploy memory corruption detection tools and enable address sanitizer (ASan) in development environments
• Monitor for anomalous memory access patterns through kernel-level instrumentation
• Implement heap integrity checking mechanisms to detect corruption early
• Use SentinelOne Singularity platform to detect exploitation attempts targeting memory corruption vulnerabilities

Monitoring Recommendations

• Enable verbose logging for system components interacting with affected Qualcomm drivers
• Monitor system stability metrics for unexplained crashes or memory errors
• Track firmware and driver version information across deployed devices
• Implement automated vulnerability scanning to identify unpatched systems

How to Mitigate CVE-2025-47394

Immediate Actions Required

• Review the Qualcomm January 2026 Security Bulletin for specific patch information
• Identify all systems using affected Qualcomm components in your environment
• Prioritize patching based on system criticality and exposure
• Implement additional access controls to limit local access to sensitive systems

Patch Information

Qualcomm has addressed this vulnerability in their January 2026 Security Bulletin. Organizations should consult the official Qualcomm security bulletin for detailed patch information and apply updates according to their device manufacturer's guidance. Firmware updates may be distributed through OEM channels depending on the affected product category.

Workarounds

• Restrict local access to systems containing vulnerable Qualcomm components to trusted users only
• Implement application sandboxing to contain potential exploitation impact
• Enable exploit mitigation technologies such as ASLR and DEP where available
• Monitor affected systems for signs of exploitation while awaiting patches