CVE-2026-84530 in iOS
Summary
by MITRE • 09/15/2026
An information disclosure issue was addressed with improved memory management. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. An app may be able to disclose kernel memory.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described constitutes a critical information disclosure flaw rooted in inadequate memory management within the operating system's core components. Specifically, this issue affects the kernel space across multiple Apple platforms including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. The root cause lies in improper handling of memory allocations or deallocations by applications interacting with the kernel. When an application performs operations that trigger specific code paths within the kernel, it can exploit a logic error or race condition to access memory regions that are not intended for public consumption. This failure in enforcing strict isolation boundaries between user-space processes and privileged kernel space allows data from sensitive areas of system memory to be leaked back to the unprivileged process. Such vulnerabilities typically arise when developers fail to properly initialize, clear, or restrict access to buffers used during inter-process communication or system calls, leading to unintended exposure of internal state information.
From a technical perspective, this flaw aligns with Common Weakness Enumeration (CWE) categories such as CWE-200: Exposure of Sensitive Information to an Unauthorized Actor and potentially CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer if heap or stack corruption is involved. The exploitation mechanism generally involves crafting specific inputs that trigger the memory management bug, causing the kernel to return pointers or raw data containing remnants of previous operations. These remnants may include cryptographic keys, session tokens, authentication credentials, or other sensitive metadata stored in kernel structures. Because the vulnerability allows an app to read arbitrary portions of kernel memory, it bypasses standard sandboxing protections designed to contain application behavior within isolated environments. This represents a significant degradation of the system's security model, as the fundamental assumption that user-space applications cannot inspect privileged memory is violated.
The operational impact of this vulnerability is severe due to its potential for privilege escalation and further exploitation. While the immediate effect is information disclosure, leaked kernel memory often contains pointers to other critical data structures or function addresses within the kernel space. Attackers can leverage these disclosed addresses to perform return-oriented programming (ROP) attacks or direct code injection techniques, effectively escalating their privileges from a standard user-level process to that of the system administrator or root. This capability transforms a simple information leak into a full compromise of device integrity. Furthermore, exposure of cryptographic material could allow attackers to decrypt previously captured traffic or impersonate legitimate services and users. The widespread nature of this flaw across all major Apple operating systems means that any application with sufficient permissions can potentially exploit it, making the attack surface broad and difficult for end-users to mitigate through simple behavioral changes alone.
In terms of threat modeling, this vulnerability maps directly to MITRE ATT&CK techniques related to Collection and Discovery. Specifically, it corresponds to T1057: Process Memory Discovery, where an adversary probes or inspects process memory to gather information useful for follow-on activity. It also relates to T1083: File and Directory Discovery if the leaked data includes file paths or directory structures accessible only by higher-privileged entities. The ability to read kernel memory is a precursor step often seen in advanced persistent threat campaigns aiming to establish persistence or move laterally within an enterprise network that relies on these devices as endpoints. By obtaining sensitive system information, attackers can fingerprint the exact version and configuration of the operating system, allowing them to tailor subsequent exploits with high precision against known weaknesses specific to that build.
Mitigation strategies primarily rely on the deployment of the provided software updates which address the underlying memory management flaws in iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27. Organizations should prioritize patching these systems to close the gap in kernel isolation. For developers, this incident reinforces the necessity of rigorous code review practices focused on memory safety, particularly when implementing system calls or interacting with low-level APIs. Utilizing static analysis tools that detect potential buffer overflows or use-after-free conditions can help prevent similar issues in future software releases. Additionally, enforcing strict sandboxing policies and minimizing the privileges granted to applications reduces the blast radius if a vulnerability is successfully exploited. Continuous monitoring for anomalous memory access patterns by endpoint detection and response systems may also provide early warning indicators of exploitation attempts targeting this class of vulnerabilities.