CVE-2026-25283: Memory Corruption Buffer Overflow Vulnerability

CVE-2026-25283 Overview

CVE-2026-25283 is a stack-based buffer overflow [CWE-121] disclosed in the Qualcomm September 2026 Security Bulletin. The flaw occurs when unverified data from an external source is copied into a fixed-size buffer without validating its length. A local attacker with low privileges can trigger memory corruption that leads to code execution in a higher-privileged context. The scope change indicated by the CVSS vector means successful exploitation impacts resources beyond the vulnerable component itself.

Critical Impact
Local low-privileged attackers can corrupt memory across a trust boundary, enabling code execution with high impact to confidentiality, integrity, and availability.

Affected Products

Qualcomm components listed in the September 2026 Security Bulletin
Refer to the Qualcomm September 2026 Security Bulletin for the authoritative list of affected chipsets and software components

Discovery Timeline

2026-09-17 - CVE-2026-25283 published to the National Vulnerability Database (NVD)
2026-09-17 - Last updated in NVD database
September 2026 - Disclosed in the Qualcomm September 2026 Security Bulletin

Technical Details for CVE-2026-25283

Vulnerability Analysis

The vulnerability is a classic stack-based buffer overflow classified under [CWE-121]. Affected code copies data received from an external source into a stack-allocated buffer without verifying that the input length fits within the destination. When the input exceeds the buffer, adjacent stack memory is overwritten, including saved return addresses and control data.

Exploitation requires local access with low privileges and no user interaction. The scope change reflected in the CVSS vector indicates that a successful exploit crosses a trust boundary, typically from an unprivileged process into a privileged kernel or firmware component on Qualcomm chipsets. Successful exploitation can yield arbitrary code execution and full compromise of the affected component.

Root Cause

The root cause is missing bounds validation before a memory copy. The affected routine trusts the length or structure of externally supplied data and calls a copy operation whose destination cannot accommodate attacker-controlled sizes. The result is deterministic overflow into adjacent stack frames.

Attack Vector

An attacker executing code on the device — for example, through a malicious application or compromised local process — submits a crafted payload to the vulnerable interface. Because the target is a privileged component, successful memory corruption escalates access beyond the caller's original privilege level. See the Qualcomm September 2026 Security Bulletin for interface-specific technical details.

Detection Methods for CVE-2026-25283

Indicators of Compromise

Unexpected crashes, kernel panics, or watchdog resets in Qualcomm driver or firmware components
Anomalous local processes issuing oversized IOCTL or shared-memory payloads to Qualcomm interfaces
Post-exploit artifacts such as unsigned kernel modules, unexpected privilege transitions, or new persistence entries

Detection Strategies

Monitor mobile device management (MDM) telemetry for repeated crashes tied to specific Qualcomm subsystems
Correlate application install events with subsequent low-level driver faults across a fleet
Baseline expected interactions with vulnerable device interfaces and alert on outliers in payload size or frequency

Monitoring Recommendations

Collect and centralize crash dumps and kernel logs from Android and embedded devices using Qualcomm chipsets
Track patch level (ro.build.version.security_patch on Android) across the fleet and flag devices missing the September 2026 update
Alert on installation of untrusted applications on devices that have not yet received the vendor patch

How to Mitigate CVE-2026-25283

Immediate Actions Required

Inventory devices using affected Qualcomm chipsets and identify those missing the September 2026 security patch level
Apply the OEM-provided update that incorporates Qualcomm's September 2026 fixes as soon as it is available for each device model
Restrict installation of untrusted or sideloaded applications on affected devices until patched

Patch Information

Qualcomm published fixes as part of the September 2026 Security Bulletin. Device OEMs integrate these patches into monthly security updates. Consult the Qualcomm September 2026 Security Bulletin for the specific components and driver versions addressed, then obtain the corresponding firmware or OS update from the device manufacturer.

Workarounds

No vendor-supplied workaround has been published; patching is the required remediation
Enforce application allowlisting through MDM to reduce the local attack surface
Disable or restrict access to non-essential Qualcomm subsystems where OEM configuration permits

bash

# Example: query Android security patch level to identify unpatched devices
adb shell getprop ro.build.version.security_patch
# Devices reporting a patch level earlier than 2026-09-01 should be prioritized for update