External risk intelligence

macOS Kernel Memory Corruption Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-64695

This vulnerability affects the macOS kernel. Kernel-level vulnerabilities are generally not directly reachable from the public internet in typical deployments, as they require local access or execution on the host system to be triggered.

Memory Corruption

Apple Macos

14.0 to before 14.8.815.0 to before 15.7.826.0 to before 26.6

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

This critical vulnerability impacts Apple's macOS operating system, allowing a remote user to potentially crash the system or corrupt critical memory. While the technical details involve memory handling, the high-level concern is a significant disruption to system stability and integrity.

Affects macOS, could cause system crashes.
Matters for overall system stability and integrity.
Confirm relevance and exposure to macOS systems.

Attack Path

How an attacker could exploit the issue

This vulnerability exists in the macOS kernel, which handles core system operations. An attacker could exploit this by sending specially crafted network requests to a vulnerable system. Successfully triggering this flaw could allow an attacker to crash the system or corrupt its memory.

Requires network access to the system.
Triggered by sending network requests.
Risks system termination and memory corruption.

Live Threat

Current exploitation, exposure, and threat context

A remote attacker could potentially trigger unexpected system termination or corrupt kernel memory. This could affect the stability and integrity of the macOS operating system.

System stability and kernel memory.
Remote user triggers unexpected behavior.
System termination or memory corruption.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability impacts the macOS kernel, requiring immediate attention from teams managing Apple endpoints. The first step is to identify all macOS systems within your environment, confirm their exposure and business criticality, and then assign ownership for remediation. Planning should consider maintenance windows and potential vendor coordination for updates.

Ownership: Endpoint and infrastructure teams.
Verify: Affected macOS systems and exposure.
Action: Plan and coordinate OS updates.

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 software affected by CVE-2026-64695?

This vulnerability impacts the macOS kernel, which is the foundational core of the Apple operating system. The kernel manages the direct interaction between software and the computer's hardware, controlling essential operations like memory allocation and process management. Because it sits at the center of the system, issues here can have broad consequences for how the entire machine functions.

What does memory corruption mean in the context of this CVE?

The vulnerability is a form of Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119). In plain terms, the kernel fails to properly check data size when writing to memory, allowing it to overflow into spaces it should not access. For CVE-2026-64695, this weakness could allow a remote attacker to overwrite critical kernel data, which typically leads to an immediate system crash or unpredictable behavior.

How is this vulnerability triggered?

An attacker triggers this flaw by sending specially crafted network requests to the target macOS device. It is important to note that typical user-level activities, such as browsing safe websites or checking email, do not inherently trigger this bug. The issue requires the system to process specific, malicious input designed to exploit the way the kernel currently handles memory.

Is my system at risk if it is not directly on the internet?

According to Halo Surface Signal, this vulnerability is very unlikely to be reachable from the public internet. While the CVSS vector notes a network attack path, the target is the macOS kernel. This means an attacker would generally need a specific level of access or successful interaction with the host system to reach the vulnerable code, making it less accessible than standard web-facing applications.

Do I need to update my macOS systems?

Yes, you should plan to update your devices to the latest versions provided by Apple, such as macOS Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6. The first step is to create an inventory of all macOS assets in your environment to determine which machines are running outdated versions. Once identified, prioritize these systems for OS updates to apply the vendor's corrected memory handling and restore system stability.

References

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.