CVE-2025-27058 Overview
CVE-2025-27058 is a memory corruption vulnerability affecting multiple Qualcomm firmware components used in connectivity and audio subsystems. The flaw occurs when packet data processing encounters an exceedingly large packet, triggering a classic buffer overflow condition tracked as [CWE-120].
A local attacker with low privileges can exploit this weakness to corrupt memory and compromise confidentiality, integrity, and availability on affected devices. The vulnerability impacts widely deployed Qualcomm chipsets including FastConnect 6900 and 7800 wireless connectivity modules and the SC8380XP compute platform.
Critical Impact
Local attackers can achieve memory corruption in Qualcomm firmware, enabling potential code execution within privileged connectivity and audio subsystems on affected mobile and compute platforms.
Affected Products
- Qualcomm FastConnect 6900 and FastConnect 7800 firmware
- Qualcomm SC8380XP compute platform firmware
- Qualcomm WCD9380, WCD9385 audio codec firmware and WSA8840, WSA8845, WSA8845H smart speaker amplifier firmware
Discovery Timeline
- 2025-07-08 - CVE-2025-27058 published to NVD
- 2025-07 - Qualcomm publishes July 2025 Security Bulletin addressing the vulnerability
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-27058
Vulnerability Analysis
The vulnerability resides in packet data processing logic within Qualcomm firmware for wireless connectivity chips and audio subsystems. When the firmware receives a packet whose size exceeds expected boundaries, it fails to validate the length before copying data into a fixed-size buffer.
This condition maps to [CWE-120], the classic buffer copy without checking size of input. The result is memory corruption in an environment where firmware executes with elevated privileges relative to the host operating system.
Because the attack vector is local, an adversary must already have code execution or a foothold on the device. Once local access is achieved, the attacker can craft oversized packets and pass them into the vulnerable processing path.
Root Cause
The root cause is missing or insufficient bounds checking during packet parsing. The firmware trusts the size of inbound packet structures and performs a copy operation using an attacker-influenced length. When the length exceeds the destination buffer, adjacent memory is overwritten.
Successful exploitation can corrupt control data, function pointers, or return addresses within the firmware execution context. This provides a primitive for achieving arbitrary code execution inside the connectivity or audio subsystem.
Attack Vector
Exploitation requires local access with low privileges and no user interaction. An attacker delivers a malformed packet through a channel that ultimately reaches the affected Qualcomm firmware component. Because these chipsets handle Wi-Fi, Bluetooth, and audio data paths, several local interfaces may reach the vulnerable code.
See the Qualcomm Security Bulletin July 2025 for the vendor's technical description and affected component list.
Detection Methods for CVE-2025-27058
Indicators of Compromise
- Unexpected crashes, resets, or watchdog events in Wi-Fi, Bluetooth, or audio subsystems on affected Qualcomm platforms
- Kernel log entries showing firmware faults, remoteproc restarts, or subsystem coredumps correlated with local process activity
- Anomalous local processes issuing large or malformed control packets to connectivity or audio driver interfaces
Detection Strategies
- Monitor host operating system logs for firmware exception traces originating from FastConnect or WCD/WSA components
- Correlate userspace process activity with subsystem crashes to identify local exploitation attempts against firmware interfaces
- Track firmware and driver versions across the fleet to identify unpatched devices exposed to this class of memory corruption
Monitoring Recommendations
- Ingest mobile and endpoint telemetry into a centralized data lake to identify patterns of firmware instability across the fleet
- Alert on repeated subsystem restarts on the same device, which may indicate exploitation attempts rather than benign faults
- Baseline normal driver and firmware behavior so deviations tied to oversized packet handling can be surfaced quickly
How to Mitigate CVE-2025-27058
Immediate Actions Required
- Apply the firmware updates referenced in the Qualcomm July 2025 Security Bulletin to all affected devices
- Inventory endpoints, mobile devices, and compute platforms that ship the affected FastConnect, SC8380XP, WCD, and WSA components
- Restrict local access on affected devices and limit the ability of low-privileged processes to interact directly with connectivity and audio driver interfaces
Patch Information
Qualcomm addressed CVE-2025-27058 in the July 2025 Security Bulletin. Original equipment manufacturers must integrate the updated firmware into device-specific builds and distribute updates through their standard channels. Administrators should track OEM release notes to confirm the fix has been delivered to production devices.
Workarounds
- No vendor-supplied workaround is documented; applying the patched firmware is the required remediation
- Reduce local attack surface by enforcing least privilege and application allow-listing on affected endpoints and mobile devices
- Isolate high-value devices from untrusted local software until the patched firmware is confirmed installed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
