CVE-2026-84567 in macOS
Summary
by MITRE • 09/15/2026
The issue was addressed with improved memory handling. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to cause unexpected system termination.
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Analysis
by VulDB Data Team • 09/15/2026
This vulnerability represents a critical flaw within the core operating system components of Apple's macOS ecosystem, specifically affecting versions prior to macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. The root cause is identified as an improper memory handling error, which typically involves issues such as use-after-free conditions, buffer overflows, or incorrect pointer management during system-level operations. In the context of operating systems, memory corruption vulnerabilities are particularly severe because they compromise the integrity of the kernel and essential system services that manage hardware resources and enforce security boundaries between applications. When an application interacts with these flawed components, it can trigger undefined behavior in the memory allocator or processor execution flow, leading to data corruption within critical system structures.
The operational impact of this vulnerability is characterized by a denial-of-service condition resulting from unexpected system termination. An unprivileged local user or a maliciously crafted application can exploit this flaw to cause the operating system to crash abruptly. This sudden termination disrupts all running processes and services, leading to significant downtime for users and potential data loss if unsaved work is not persisted before the crash occurs. While the primary impact described is availability-related, memory corruption vulnerabilities often carry a higher risk profile because they can sometimes be chained with other flaws or manipulated in ways that lead to arbitrary code execution, although the specific report highlights system termination as the direct consequence. This makes the vulnerability particularly dangerous in multi-user environments or on servers where stability and continuous operation are paramount.
From a classification perspective, this issue aligns closely with CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer if it involves buffer overflows, or more likely CWE-416 Use After Free if the crash results from accessing memory that has been deallocated. These categories highlight fundamental failures in input validation and resource management by developers. In terms of adversary tactics, this vulnerability could be leveraged under MITRE ATT&CK technique T1529 System Shutdown/Reboot, where an attacker disrupts service availability to cause operational disruption or distract security teams during a broader attack campaign. It may also relate to T1499 Endpoint Denial of Service if the goal is purely disruptive rather than preparatory for further exploitation.
Mitigation strategies primarily involve immediate patching through official Apple software update channels, ensuring that systems are upgraded to macOS Golden Gate 27 or later versions which include the corrected memory handling routines. For environments where immediate patching is not feasible due to compatibility concerns, network segmentation can help limit exposure by restricting access to vulnerable services from untrusted networks. Additionally, deploying endpoint detection and response solutions with behavioral monitoring capabilities may help identify anomalous process behavior that attempts to trigger such crashes, although definitive prevention requires the underlying code fix provided in the updated operating system versions. Regular maintenance of OS components is essential to mitigate risks associated with low-level memory management flaws that affect core stability.