CVE-2020-11261

What Are Qualcomm Snapdragon Chipsets?

Snapdragon is Qualcomm's family of system-on-chip platforms, powering the large majority of Android smartphones worldwide along with automotive infotainment systems, IoT devices, and wearables. Because Snapdragon components ship across so many device categories from so many different manufacturers, a single flaw in shared low-level chipset code can affect a vast and heterogeneous population of devices simultaneously — and patching depends on each device maker separately incorporating and shipping Qualcomm's fix, which historically causes long tails of unpatched devices even after Qualcomm itself resolves an issue.

Overview

CVE-2020-11261 is a memory corruption vulnerability (CWE-787, out-of-bounds write) affecting a wide range of Snapdragon product lines — Auto, Compute, Connectivity, Consumer IoT, Industrial IoT, Mobile, Voice & Music, and Wearables. The flaw occurs because chipset code fails to properly validate and reject a memory allocation request for an excessively large size from a user-space application, leading to memory corruption that a local attacker with low privileges can exploit for further compromise (CVSS 3.1: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, 7.8 High).

Technical Details

The root cause is a missing bounds check: when an application requests a memory allocation, the affected chipset driver code should validate the requested size and reject unreasonably large values, but instead proceeds without adequate validation, corrupting adjacent memory. Because the flaw sits in low-level chipset driver code shared across many device categories, its practical impact and exploitability vary by which specific driver component and device integration is affected.

Discovery

Patched as part of Qualcomm's routine June 2020 security bulletin, which addresses vulnerabilities across the Snapdragon product line reported through Qualcomm's standard vulnerability disclosure process.

Exploitation Context

CISA added this CVE to KEV in December 2021 based on confirmed exploitation. As with most chipset-level Android vulnerabilities, the practical remediation timeline depends heavily on device manufacturers incorporating Qualcomm's fix into their own firmware updates and end users actually installing them — a chain with multiple potential points of delay well beyond Qualcomm's own June 2020 patch date.

Remediation

1. Apply the latest Android security update from your device manufacturer that incorporates Qualcomm's June 2020 Snapdragon patches — check your device settings for pending OS updates.
2. Retire devices that no longer receive security updates from their manufacturer, particularly for any Snapdragon-based device used in a business or industrial context.
3. For automotive, industrial IoT, or embedded Snapdragon deployments, coordinate with your equipment vendor on firmware update availability, since these device categories often have longer and less predictable patch cycles than consumer smartphones.
4. Restrict installation of untrusted applications on affected devices as defense-in-depth, since exploitation requires a local, low-privileged attacker (i.e., malicious code already running on the device).