CVE-2025-27067 Overview
CVE-2025-27067 is a memory corruption vulnerability affecting multiple Qualcomm firmware components. The flaw occurs while processing a Device Driver Interface (DDI) call with an invalid buffer. The issue is tracked under CWE-129: Improper Validation of Array Index and impacts Qualcomm WSA audio codecs, FastConnect wireless subsystems, WCD audio codecs, and the SC8380XP compute platform.
A local attacker with low privileges can trigger the flaw without user interaction to corrupt kernel or driver memory. Qualcomm addressed the issue in the August 2025 Security Bulletin.
Critical Impact
Successful exploitation results in memory corruption within a privileged driver context, threatening confidentiality, integrity, and availability of the host device.
Affected Products
- Qualcomm WSA8840, WSA8845, WSA8845H audio codec firmware
- Qualcomm FastConnect 6900 and FastConnect 7800 firmware
- Qualcomm SC8380XP, WCD9380, and WCD9385 firmware
Discovery Timeline
- 2025-08-06 - CVE-2025-27067 published to NVD alongside the Qualcomm August 2025 Security Bulletin
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-27067
Vulnerability Analysis
The vulnerability resides in a Qualcomm driver routine that services DDI calls from userspace or lower-privileged components. The routine fails to validate the buffer supplied by the caller before dereferencing or indexing into it. When an invalid or attacker-crafted buffer is passed, the driver corrupts memory belonging to the kernel or another privileged context.
The CWE-129 classification indicates improper validation of an array index. The driver accepts index or size fields from the DDI payload and uses them directly in memory operations without range checks. This produces out-of-bounds read or write conditions within the driver's address space.
Because the affected components include Wi-Fi, Bluetooth, and audio subsystems shipped on mobile and compute platforms, the corrupted state may transition into elevated code execution, driver crash, or device compromise depending on the exact allocation targeted.
Root Cause
The root cause is missing bounds validation on data received through a driver interface. Attacker-controlled length or index fields are trusted by the DDI handler and applied to memory access primitives inside the driver.
Attack Vector
Exploitation requires local access and low privileges on the target device. The attacker issues a crafted DDI call carrying an invalid buffer to the affected Qualcomm driver. No user interaction is required. See the Qualcomm Security Bulletin August 2025 for vendor-supplied technical detail.
Detection Methods for CVE-2025-27067
Indicators of Compromise
- Unexpected kernel or driver crashes referencing Qualcomm audio, WCD, WSA, or FastConnect modules
- Kernel panic logs or dmesg output showing memory faults inside DDI handler paths
- Anomalous local processes issuing repeated ioctl or DDI calls to affected drivers
Detection Strategies
- Monitor endpoint telemetry for unsigned or unexpected user-space processes interacting with Qualcomm driver interfaces
- Correlate driver crash dumps with process ancestry to identify the caller responsible for the malformed DDI request
- Baseline normal DDI call patterns per device class and alert on deviations in call frequency or payload size
Monitoring Recommendations
- Ingest mobile and endpoint crash logs into a centralized logging platform for retrospective analysis
- Track firmware and patch level of Qualcomm components across the device fleet
- Alert on privilege escalation attempts following driver instability events
How to Mitigate CVE-2025-27067
Immediate Actions Required
- Apply the firmware updates published in the Qualcomm August 2025 Security Bulletin
- Inventory devices containing WSA8840/8845/8845H, WCD9380/9385, FastConnect 6900/7800, or SC8380XP components
- Restrict installation of untrusted local applications on affected devices until patches are deployed
Patch Information
Qualcomm released fixes as part of the August 2025 Security Bulletin. OEM device manufacturers must integrate the patched firmware into their platform updates. Administrators should track OEM update availability for Android handsets, Windows-on-Snapdragon systems, and IoT devices using the affected chipsets.
Workarounds
- Enforce application allowlisting to prevent execution of untrusted local binaries capable of issuing DDI calls
- Apply mobile device management policies that block sideloading and enforce least-privilege user accounts
- Segment affected devices from sensitive networks until firmware updates are confirmed installed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
