External risk intelligence

Qualcomm chipsets could allow an external attacker to gain full device control.

CVE advisoryKnown Exploit

CVE-2026-21385

An external attacker could use a security flaw in Qualcomm chipsets to gain persistent, full control over a device. This could lead to unauthorized access to sensitive information and total compromise of the affected system.

1Halo Surface Signal

Integer Overflow

Qualcomm Sm7675p Firmware

External exposure likelihood

Halo Surface Signal score for CVE-2026-21385

This vulnerability exists within internal chipset memory allocation processes. Exploitation requires an attacker to already have the ability to execute an application on the affected device to trigger the flaw. It does not represent an internet-facing service, gateway, or remote network-accessible interface, making public internet exposure of this surface unlikely.

Horizon Alert

Summary of the vulnerability and why it matters

This security issue involves a memory corruption vulnerability in Qualcomm chipsets that can occur during memory allocation. It's important to address because it could allow for significant compromise if exploited.

  • Enables unauthorized code execution.
  • Affects many devices.
  • Requires existing access.

Attack Path

How an attacker could exploit the issue

An attacker with local code execution on a vulnerable device could exploit this memory corruption flaw by manipulating memory allocation alignments. This could lead to unexpected program behavior or even allow the attacker to gain elevated privileges on the device. The key is to trigger the specific alignment condition that causes the corruption.

  • Local code execution is required.
  • Triggering memory allocation alignments is key.
  • Privilege escalation is a potential outcome.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability, classified as internal, involves memory corruption within Qualcomm chipsets, requiring local code execution to exploit. While its CVSS score indicates a potential for high impact, its internal nature suggests attackers would need to compromise a device first, making it less attractive for broad, remote exploitation.

  • KEV listed; likely targeted.
  • Recent publication date.
  • Exploitation requires local access.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize patching for affected Qualcomm chipsets, focusing on devices where local code execution is possible. Given the high severity and listing on the Known Exploited Vulnerabilities catalog, immediate action is critical. If patching is not yet feasible, isolate potentially affected devices from critical networks to limit the blast radius.

  • Apply Qualcomm security bulletin updates.
  • Isolate affected devices from the network.
  • Monitor for suspicious local process activity.

Frequently asked questions

What are Qualcomm Snapdragon chipsets used for?

Qualcomm Snapdragon chipsets are the processors found in many mobile phones, smart displays, and other devices. They power the core functions of these electronics, enabling features like internet connectivity, app execution, and multimedia capabilities. This vulnerability affects various Snapdragon models, including those used for mobile platforms and smart audio systems.

What is a memory corruption vulnerability in CVE-2026-21385?

CVE-2026-21385 is a type of memory corruption vulnerability, specifically an integer overflow (CWE-190). This means that when the software tries to allocate memory, an issue with how it handles numbers can lead to incorrect memory management. This can corrupt data or even allow an attacker to take control of the device by manipulating how memory is used.

How could CVE-2026-21385 be triggered?

This vulnerability is triggered by an integer overflow that occurs during memory allocation processes within the affected Qualcomm chipsets. Exploitation requires an attacker to already have the ability to execute an application on the device. The vulnerability is not triggered by internet-facing services or remote network access.

Who needs to be concerned about this Qualcomm vulnerability?

Anyone using devices with the affected Qualcomm chipsets should be aware of this vulnerability. While the flaw is classified as internal, meaning it doesn't directly expose internet-facing services, it can be exploited if an attacker can run an application on the device. This means users of smartphones, smart displays, and other connected devices powered by these chipsets are potentially at risk.

What is the first step to address this vulnerability?

The first step for anyone running affected Qualcomm technology is to check for and apply any firmware or software updates provided by the device manufacturer or Qualcomm. For cloud services, follow guidance from applicable operational directives. If no mitigations are available, consider discontinuing the use of the product.

References