CVE-2026-24085: Qualcomm Qca6391 Buffer Overflow Flaw

CVE-2026-24085 Overview

CVE-2026-24085 is a memory corruption vulnerability affecting a wide range of Qualcomm chipsets and firmware, including Snapdragon mobile, automotive, compute, wearable, and connectivity platforms. The flaw occurs when the firmware processes display command line information using a variable that has not been properly initialized. An attacker with physical access and high privileges can leverage this uninitialized memory condition to corrupt firmware memory state. The issue is classified under [CWE-121: Stack-based Buffer Overflow] and was disclosed in Qualcomm's June 2026 Security Bulletin.

Critical Impact

Successful exploitation can lead to high impact on confidentiality, integrity, and availability across affected Qualcomm components, with the scope extending beyond the vulnerable component.

Affected Products

• Qualcomm Snapdragon mobile platforms (Snapdragon 8 Gen 1/2/3, 8 Elite, 8+ Gen 1/2, 865/870/888 5G, and other generations)
• Qualcomm automotive and modem platforms (Snapdragon Auto 5G Modem-RF, SA8155P, SA8295P, SA8770P, X55/X65/X72/X75 5G Modem-RF systems)
• Qualcomm connectivity, audio, and IoT firmware (QCA, WCN, WCD, WSA, FastConnect, Robotics RB2/RB5, Vision Intelligence 400)

Discovery Timeline

• 2026-06-01 - CVE-2026-24085 published to NVD
• 2026-06-02 - Last updated in NVD database
• June 2026 - Qualcomm publishes June 2026 Security Bulletin

Technical Details for CVE-2026-24085

Vulnerability Analysis

The vulnerability resides in firmware logic that handles display command line information. During this processing path, a local variable is used before it has been explicitly initialized. The uninitialized value influences memory operations, leading to stack-based memory corruption consistent with [CWE-121]. Because the impacted code path runs within trusted firmware components, the corrupted state can affect adjacent execution contexts. This is reflected in the scope-changed classification, where the vulnerable component can impact resources beyond its own security boundary.

Root Cause

The root cause is improper initialization of a variable prior to its use in the display command line handling routine. When the firmware later reads this variable as a length, offset, or pointer-related value, the residual stack data drives subsequent writes and computations. This produces deterministic or attacker-influenced memory corruption depending on prior stack contents.

Attack Vector

Exploitation requires physical access to the device and high privileges on the target. An adversary capable of interacting with the firmware's display command line interface can trigger the vulnerable code path. Successful exploitation yields high confidentiality, integrity, and availability impact, and may cross trust boundaries within the chipset. No user interaction is required once the attacker has the necessary local access. Public proof-of-concept code is not available, and the vulnerability is not listed in the CISA KEV catalog.

No verified exploit code is publicly available. Refer to the Qualcomm June 2026 Security Bulletin for technical guidance.

Detection Methods for CVE-2026-24085

Indicators of Compromise

• Unexpected firmware crashes, watchdog resets, or kernel panics referencing display command line handling components.
• Devices reporting firmware versions older than those listed as patched in the Qualcomm June 2026 Security Bulletin.
• Anomalous post-boot diagnostic logs indicating stack corruption or aborts in display-related firmware modules.

Detection Strategies

• Inventory endpoints and embedded devices to identify Qualcomm chipsets enumerated in the advisory, including Snapdragon mobile, automotive, and connectivity SoCs.
• Correlate vendor firmware build identifiers against the patched versions published in the Qualcomm June 2026 Security Bulletin.
• Monitor for repeated crash signatures from display subsystems on automotive head units, IoT gateways, and mobile devices that may indicate triggering of the vulnerable path.

Monitoring Recommendations

• Enable detailed firmware and bootloader logging where available to capture abort, exception, and watchdog events.
• Track physical access controls and audit logs for serviced devices in fleets such as vehicles, kiosks, and industrial endpoints.
• Review supplier and OEM advisories for downstream patch availability, since Qualcomm components are integrated by multiple device manufacturers.

How to Mitigate CVE-2026-24085

Immediate Actions Required

• Identify all assets containing affected Qualcomm chipsets and firmware listed in the advisory.
• Apply OEM firmware updates that incorporate Qualcomm's June 2026 patches as soon as they are made available by the device manufacturer.
• Restrict and audit physical access to high-value devices, particularly automotive, IoT, and industrial platforms based on Snapdragon components.

Patch Information

Qualcomm has addressed CVE-2026-24085 in the June 2026 Security Bulletin. Device manufacturers and OEMs must integrate the corrected firmware into their respective product updates. Customers should obtain fixed firmware through their OEM's official update channels.

Workarounds

• Enforce strict physical security for devices that cannot yet receive the firmware patch, since the attack vector requires local physical access.
• Limit administrative and high-privilege accounts on affected devices to reduce the population of users able to reach the vulnerable display command line interface.
• Disable or restrict diagnostic, service, and developer modes on production devices where supported by the OEM.

# Configuration example: verify device firmware against vendor advisory
# (Adapt commands to the specific OEM platform)

# Android-based devices: check build and security patch level
adb shell getprop ro.build.version.security_patch
adb shell getprop ro.boot.bootloader
adb shell getprop ro.vendor.build.fingerprint

# Cross-reference output with the OEM advisory referencing
# Qualcomm June 2026 Security Bulletin (CVE-2026-24085)