CVE-2026-65402 in iOS
Summary
by MITRE • 09/15/2026
A use after free 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 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 vulnerability described constitutes a classic use-after-free memory corruption flaw within the Apple operating systems ecosystem, specifically affecting iOS, iPadOS, macOS, tvOS, visionOS, and watchOS versions prior to their respective 26.7 or 15.8/17 updates depending on the specific platform lineage. This type of vulnerability arises when a program continues to use a pointer after the memory it points to has been freed, often referred to as a dangling pointer scenario. In this context, an application can trigger conditions where system resources are deallocated while still being referenced by active processes or internal kernel structures. The root cause typically involves improper lifecycle management of objects in memory, where the reference counting mechanism fails to account for all outstanding references before releasing the underlying storage space. This leads to a state where subsequent access operations target invalid or recycled memory addresses rather than valid data structures.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they allow an attacker to manipulate how freed memory is reused by the system. If an application can control what gets allocated in that reclaimed memory space before it is accessed again, it may be able to overwrite critical data or execute arbitrary code. However, as noted in the provided description, the immediate observable impact for this specific instance is unexpected system termination rather than full remote code execution. This suggests that while the vulnerability exists and can be exploited to corrupt state, mitigations such as Address Space Layout Randomization (ASLR), Data Execution Prevention (DEP), or hardened runtime protections may have prevented a more severe compromise in many scenarios. The result of triggering this flaw is typically a crash due to an access violation when the system attempts to read from or write to memory that no longer belongs to the process, leading to instability and potential denial of service conditions for affected applications and potentially the entire device if kernel-level resources are involved.
The operational impact of this vulnerability centers on reliability and availability rather than confidentiality or integrity in its current manifestation. An attacker with local access could craft a malicious application designed to repeatedly trigger the memory management error, causing frequent crashes of system services or user-facing apps. This degradation of service can disrupt normal device functionality, leading to data loss if unsaved work is involved due to sudden terminations. Furthermore, while the primary effect described is termination, use-after-free flaws are historically gateways for privilege escalation and arbitrary code execution. Security researchers often view these vulnerabilities as high-risk because they provide a mechanism to gain control over memory layout or execute shellcode through heap spraying techniques if other mitigations are bypassed. The fact that it causes system termination indicates the exploitability might be limited by current sandboxing policies, but the underlying flaw remains significant from a code quality and security hygiene standpoint.
To mitigate this vulnerability, users must ensure their devices are updated to the specified versions: iOS 26.7 or later for iPhone and iPad, macOS Sequoia 15.8 or Golden Gate/Tahoe equivalents depending on the specific build lineage, along with corresponding updates for tvOS, visionOS, and watchOS. These patches contain corrected memory management logic that ensures pointers are nullified after deallocation or properly reference-counted to prevent premature freeing. For developers, this serves as a critical reminder to rigorously audit object lifecycles, particularly in complex frameworks where asynchronous operations might leave dangling references active during cleanup phases. Utilizing static analysis tools and dynamic memory checkers like AddressSanitizer can help identify such issues early in the development cycle. Additionally, adhering to secure coding standards that emphasize explicit ownership semantics for objects helps prevent these types of race conditions or logic errors from reaching production environments.
In terms of industry classification frameworks, this vulnerability aligns with CWE-416: Use After Free, which is a subset of improper memory management practices defined in the Common Weakness Enumeration database. It also relates to CWE-787: Out-of-bounds Write if the freed memory overlap leads to corruption beyond its original bounds. From an offensive security perspective, this falls under MITRE ATT&CK technique T1203: Exploitation for Defense Evasion or potentially T1059: Command and Scripting Interpreter if used as a step toward further compromise, although in this specific case it is primarily categorized under initial exploitation vectors leading to denial of service. The fix represents a standard patch application process where the vendor has identified the flawed memory handling routine and implemented safeguards to ensure that once an object's reference count drops to zero, no other part of the system retains access to its resources until new allocation occurs safely.