CVE-2026-84506 in macOS
Summary
by MITRE • 09/15/2026
A use after free issue was addressed with improved memory management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to execute arbitrary code with kernel privileges.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described constitutes a critical use-after-free condition within the macOS operating system core components, specifically addressed in updates for macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. A use-after-free error occurs when software continues to use memory that has already been freed or deallocated by the system. In this context, the flaw resides within kernel-level code responsible for managing dynamic memory allocation during specific operational sequences. When an application triggers a sequence of events that leads to premature memory release while references to that same memory block remain active in other parts of the kernel execution flow, the operating system may inadvertently access stale pointers. This scenario creates a dangerous state where the integrity of the memory management subsystem is compromised, allowing for potential exploitation by malicious actors seeking to escalate their privileges from user space to kernel space.
From a technical perspective, this vulnerability aligns with CWE-416, which defines use after free as referencing memory that has been freed. The operational impact of such a flaw in the macOS kernel is severe because it bypasses standard sandboxing and permission boundaries enforced by the operating system's security model. If an attacker can successfully trigger the race condition or logic error that leads to this state, they may be able to overwrite adjacent heap structures with controlled data. This manipulation allows for arbitrary code execution within the context of the kernel, granting the malicious process full control over the underlying hardware and all other running applications. Such privilege escalation effectively neutralizes most modern macOS security features, including System Integrity Protection (SIP), as the attacker operates at a level above these safeguards.
The exploitation path typically involves an unprivileged application interacting with system services or drivers that handle complex memory operations. By carefully crafting inputs to manipulate allocation and deallocation timing, an adversary can achieve code execution without requiring any special permissions initially. This behavior is consistent with techniques documented in the MITRE ATT&CK framework under privilege escalation vectors, particularly those involving kernel exploitation via heap corruption or use-after-free conditions. The ability to execute arbitrary code with kernel privileges means that sensitive data such as passwords, encryption keys, and personal information stored on the device becomes fully accessible to the attacker. Furthermore, a compromised kernel can be used to install persistent rootkits or disable security monitoring tools entirely.
Mitigation for this vulnerability relies primarily on timely software updates provided by Apple. Administrators and end-users must ensure that their devices are running macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7 or later versions where the memory management logic has been corrected to prevent access to freed memory blocks. Beyond patching, defense-in-depth strategies should be employed, including enabling FileVault for data-at-rest encryption and utilizing Gatekeeper to restrict software execution to identified developers. Regular auditing of installed applications can also reduce the attack surface by minimizing the number of potential entry points that could trigger such kernel-level flaws. Continuous monitoring for anomalous system behavior or unexpected privilege changes may help detect exploitation attempts in real-time, although proactive patching remains the most effective countermeasure against this class of vulnerability.