External risk intelligence

Out of Bounds Write in rmmi_utility C leading to Remote Code Execution.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-58799

The vulnerability exists within the rmmi_utility.c component, which is a low-level internal utility file typically found in Android system/hardware abstraction layers. Such components perform local system tasks and are not exposed as internet-facing network services or gateways, making public-internet-reachable exploitation very unlikely.

Memory Corruption

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 security vulnerability has been identified that could allow for remote code execution on affected systems without user interaction. This issue stems from a missing bounds check in specific utility functions, potentially leading to unauthorized control of the system. The main concern is to confirm relevance and exposure across our technology landscape.

Missing check allows code execution.
Critical flaw, no user action needed.
Confirm if we use this technology.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted data over the network, which is processed by vulnerable functions within `rmmi_utility.c`. Because no special privileges or user interaction are required, an attacker could remotely trigger an out-of-bounds write. This could potentially allow them to execute arbitrary code on the affected system.

Requires network access.
Vulnerable functions in `rmmi_utility.c`.
Remote code execution risk.

Live Threat

Current exploitation, exposure, and threat context

A vulnerability in rmmi_utility.c could allow for remote code execution without user interaction or additional privileges when supported by the advisory. This could impact system integrity and confidentiality.

System commands and data integrity.
Triggered by a missing bounds check.
Potential for unauthorized system control.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability resides in a low-level internal utility component, suggesting it's unlikely to be directly exposed to the public internet. Initial efforts should focus on identifying where this component is deployed within your environment and assessing its business criticality and potential exposure. Once identified, the accountable owner must be determined to plan a risk-based remediation strategy.

Identify the accountable owner for the component.
Verify the component's deployment and exposure.
Plan remediation based on identified risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the rmmi_utility.c component in Android?

The rmmi_utility.c file is a low-level internal utility component situated within the Android operating system's hardware abstraction layers. These layers act as a bridge between the physical hardware and the higher-level Android software, managing specialized local system tasks rather than general user applications.

What does an out-of-bounds write mean for CVE-2026-58799?

This vulnerability is classified as CWE-119 and CWE-787. It occurs when software writes data past the intended buffer space in memory, potentially overwriting adjacent data or instructions. In this specific CVE, the missing bounds check allows an attacker to manipulate memory, which can lead to unauthorized remote code execution.

How is this vulnerability triggered?

The flaw is triggered when the affected functions process specially crafted network data. It is important to note that internal system processes that do not handle external network input or that strictly validate the size of incoming data packets are not susceptible to this specific trigger path.

Is CVE-2026-58799 likely to be attacked over the internet?

According to the Halo Surface Signal, exploitation via the public internet is very unlikely. Because the vulnerable code exists within internal low-level hardware abstraction layers—which generally do not function as network-facing services—it is not typically reachable by remote attackers.

What should I do if I manage systems with this component?

Begin by auditing your environment to locate where this specific utility is deployed and determine its business role. Since this is an internal component, focus on verifying your system architecture rather than public-facing services, and coordinate with the accountable owners to plan a strategy for applying security updates.

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.