CVE-2026-84616 in iOS
Summary
by MITRE • 09/15/2026
A type confusion issue was addressed with improved memory handling. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. An app may be able to cause unexpected system termination.
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Analysis
by VulDB Data Team • 09/15/2026
The disclosed vulnerability represents a critical type confusion flaw within the operating system's memory management subsystems across multiple Apple platforms including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. Type confusion is a class of software vulnerabilities that occurs when an application or system component incorrectly interprets data types during execution. In this specific instance, the issue stems from inadequate validation and handling of object types in memory, leading to scenarios where the system expects one data structure but processes another due to improper casting or type checking mechanisms. This fundamental discrepancy allows for unpredictable behavior within the kernel or core system services that rely on strict type integrity to maintain stability and security boundaries between user-space applications and privileged system resources.
From a technical perspective, this flaw likely involves a failure in the runtime environment's ability to verify object types before performing operations on them. When an application triggers this condition by passing data of an unexpected or malformed type into a function that assumes a different structure, the memory layout is misinterpreted. This can lead to out-of-bounds reads or writes if the system attempts to access fields based on the wrong structural definition. While the immediate symptom described is system termination, such errors often serve as precursors to more severe exploits. If an attacker can control the data being passed into these vulnerable functions, they might manipulate memory contents in ways that allow for arbitrary code execution, privilege escalation, or bypassing of security mitigations like Address Space Layout Randomization and stack canaries, although the primary reported impact here is denial of service through crash conditions.
The operational impact of this vulnerability centers on system stability and availability. As noted, an unprivileged application may be able to cause unexpected system termination by exploiting this type confusion error. This constitutes a Denial of Service condition where legitimate users are interrupted due to crashes in core services or the entire device rebooting. In mobile environments like iOS and iPadOS, such instability can disrupt critical functions including communication, navigation, and security monitoring tools. For desktop platforms like macOS, it may lead to data loss if unsaved work is lost during a forced restart or cause service interruptions for professional workflows that depend on continuous uptime. The widespread nature of the fix across multiple operating system versions indicates that this flaw exists in shared core components used by all Apple device families, amplifying its potential reach and severity.
Mitigation strategies primarily involve applying the provided software updates which address these memory handling deficiencies through improved validation logic and stricter type checking protocols. Administrators should ensure that iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27 are installed on all relevant devices to patch this specific memory management flaw. Beyond immediate patching, developers should adhere to secure coding practices that emphasize rigorous input validation and type safety checks before processing external data. Security teams should monitor for anomalous system crashes or unexpected terminations of core processes as indicators of potential exploitation attempts in environments where patches cannot be immediately applied.
This vulnerability aligns with CWE-843 which describes access of incorrect memory location due to misinterpretation of object types, a common root cause in complex systems like operating kernels and runtime environments. It also relates to ATT&CK techniques involving execution manipulation or resource hijacking through denial of service vectors. The fix emphasizes the importance of robust memory management frameworks that enforce strict type boundaries, preventing applications from exploiting ambiguities in data structure interpretation. By resolving these issues at the system level, Apple reduces the attack surface for both local privilege escalation and remote exploitation scenarios that rely on crashing services to achieve malicious objectives or disrupt operations.