External risk intelligence

CHRE Heap Buffer Overflow Allows Remote Privilege Escalation

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-58722

The vulnerability exists within the CHRE (Context Hub Runtime Environment) implementation, which is a low-level system component responsible for managing sensors and other hardware on mobile devices. It operates within the device's isolated hardware environment and is not a service exposed to the public internet or network-reachable in common deployments.

Buffer Overflow

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified that could allow for remote escalation of privileges on affected systems without requiring user interaction or special permissions. This issue stems from a logic error within a specific code component that handles discovery responses, potentially leading to a heap buffer overflow.

A code error could let attackers gain control.
It affects device-level security systems.
Verify if this technology is in use.

Attack Path

How an attacker could exploit the issue

An attacker could exploit a heap buffer overflow vulnerability within the CHPP discovery client code to gain elevated privileges remotely. This flaw exists in the `chppProcessDiscoverAllResponse` function in `system/chre/chpp/clients/discovery.c` and can be triggered without user interaction, leading to potential remote privilege escalation.

No special access required.
Vulnerable code triggered remotely.
Remote privilege escalation risk.

Live Threat

Current exploitation, exposure, and threat context

A Heap Buffer Overflow vulnerability in the Context Hub Runtime Environment (CHRE) could allow for remote privilege escalation. This vulnerability exists within a logic error in the `chppProcessDiscoverAllResponse` function of `system/chre/chpp/clients/discovery.c`. Exploitation does not require user interaction or additional execution privileges.

System-level code execution.
Logic error in CHRE processing.
Unauthorized system control.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in the CHRE implementation likely impacts device manufacturers or platform teams responsible for the underlying operating system and hardware abstraction layers. The first practical step is to determine if any owned devices or systems utilize the affected CHRE component, confirm its exposure or criticality, and identify the accountable owner for remediation.

Platform or device manufacturers own remediation.
Verify CHRE component usage and exposure.
Plan vendor coordination and risk mitigation.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is the Context Hub Runtime Environment (CHRE)?

CHRE is a low-level system component found in mobile devices. It manages hardware sensors and peripheral data processing, running in an isolated environment to handle background tasks efficiently without impacting the main operating system's primary performance.

What does CVE-2026-58722 mean by heap buffer overflow?

This is a memory safety issue where the program writes more data to a specific memory area than it can hold. Because of a logic error in how the software processes discovery responses, this overflow can allow unauthorized system control.

How is the CVE-2026-58722 vulnerability triggered?

It is triggered through the CHPP discovery client code. While the flaw allows for remote access without user interaction, it specifically requires interacting with the discovery response mechanism; normal, non-discovery-related background activities do not trigger the bug.

Do I need to worry if my device is not internet-facing?

According to Halo Surface Signal, this vulnerability is very unlikely to affect most users because CHRE operates in an isolated hardware environment and is typically not reachable via the public internet or standard network connections.

What should I do if I manage systems using this technology?

Begin by identifying if your hardware platform utilizes the CHRE component. Since remediation typically happens at the manufacturer or operating system level, coordinate with your vendors to track official security updates and confirm if your specific devices are impacted.

References

source.android.com/docs/security/bulletin/pixel/2026/2026-11-01

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.