CVE-2026-28968 in iOS
Summary
by MITRE • 09/14/2026
An out-of-bounds write issue was addressed with improved bounds checking. 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 or corrupt kernel memory.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability described constitutes a critical out-of-bounds write flaw within the core operating systems of Apple devices, specifically affecting iOS, iPadOS, macOS, tvOS, visionOS, and watchOS versions listed in the advisory. This type of defect is fundamentally categorized under CWE-787: Out-of-Bounds Write, which represents one of the most dangerous classes of memory corruption vulnerabilities because it allows an attacker to write data to a memory location outside the bounds of the intended buffer. In this specific instance, the issue was addressed by implementing improved bounds checking mechanisms within the affected system components. The absence of these checks previously allowed applications or malicious actors to manipulate pointer arithmetic or input validation logic, resulting in writes that exceeded the allocated memory space for the target data structure.
The operational impact of such a vulnerability is severe due to its potential to compromise both confidentiality and integrity at the kernel level. As noted in the advisory, an app may be able to cause unexpected system termination, which corresponds to a denial-of-service condition where the operating system crashes or reboots to protect itself from further corruption. More critically, the ability to corrupt kernel memory opens the door for privilege escalation attacks. By overwriting specific structures within the kernel's memory space, such as function pointers, object headers, or security tokens, an attacker can redirect execution flow or elevate their process privileges from a restricted user context to that of the root superuser. This effectively grants full control over the device, allowing for the installation of persistent malware, exfiltration of sensitive data, and bypassing of sandbox restrictions designed to isolate applications from one another and from system resources.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK techniques related to privilege escalation and defense evasion. Specifically, it facilitates T1068: Exploitation for Privilege Escalation, where an attacker leverages software vulnerabilities to gain higher-level permissions on the target operating system. The out-of-bounds write serves as the initial exploitation vector that enables subsequent malicious activities such as data exfiltration or lateral movement within a networked environment if the device is connected to corporate resources. The fact that this issue affects multiple platforms including macOS and iOS indicates a systemic weakness in shared kernel components or common frameworks used across Apple's ecosystem, necessitating coordinated patching efforts across all affected operating system versions.
Mitigation strategies primarily rely on the deployment of the provided software updates for 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. These updates contain the necessary code changes to enforce strict boundary checks before memory writes are executed, thereby preventing the overflow condition that leads to corruption. For organizations managing fleets of Apple devices, it is imperative to prioritize these patches through Mobile Device Management (MDM) solutions or automated update policies to ensure all endpoints are protected against exploitation. Additionally, developers should review their applications for any reliance on unsafe memory operations and adopt secure coding practices such as using bounds-checked libraries and static analysis tools that can detect potential out-of-bounds access during the development lifecycle. Regular security audits and penetration testing focused on memory safety issues will further reduce the attack surface associated with similar vulnerabilities in future software releases.