CVE-2026-84602 Overview
CVE-2026-84602 is a type confusion vulnerability [CWE-843] affecting multiple Apple operating systems. A local application can trigger unexpected system termination by exploiting improper type checking within an affected system component. Apple addressed the flaw with improved checks across its platform lineup.
The vulnerability requires local access and low privileges, with no user interaction needed. Successful exploitation impacts availability by causing a denial of service through system termination. Confidentiality and integrity are not affected.
Critical Impact
A malicious application with local access can cause unexpected system termination across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS devices, disrupting device availability.
Affected Products
- Apple iOS and iPadOS (versions prior to 26.7 and 27)
- Apple macOS (Sequoia prior to 15.8, Tahoe prior to 26.7, Golden Gate prior to 27)
- Apple tvOS 27, visionOS 27, and watchOS 27
Discovery Timeline
- 2026-09-14 - CVE-2026-84602 published to the National Vulnerability Database
- 2026-09-18 - Last updated in NVD database
Technical Details for CVE-2026-84602
Vulnerability Analysis
CVE-2026-84602 is a type confusion vulnerability classified under [CWE-843]. Type confusion occurs when code allocates or accesses a resource using one type but later interprets that resource as an incompatible type. This mismatch can corrupt runtime state and destabilize the affected process.
In this case, an application running locally on an affected Apple platform can trigger the flawed code path to cause unexpected system termination. Apple's advisories describe the fix as improved checks, indicating stricter validation before operating on typed objects.
Root Cause
The root cause is missing or insufficient type validation in an affected Apple system component. When a specially crafted input reaches the vulnerable code, the process operates on data assuming a type that does not match its actual layout. This leads to invalid memory access and process or system termination.
Attack Vector
Exploitation requires local access to the target device and the ability to run an application with low privileges. No user interaction is required. The impact is limited to availability, with the primary outcome being unexpected system termination rather than code execution or data disclosure. Refer to the Apple Security Advisory #149034 and related bulletins for platform-specific technical details.
Detection Methods for CVE-2026-84602
Indicators of Compromise
- Unexpected system reboots or kernel panics on Apple devices without a documented hardware or software cause
- Repeated application crashes correlated with a specific process invoking system services
- Crash logs referencing type-mismatch faults or invalid pointer access in system components
Detection Strategies
- Review device crash and panic logs collected through Apple MDM solutions for repeated terminations tied to a single application
- Correlate application installation events with subsequent system instability across managed fleets
- Monitor for unsigned or newly sideloaded applications on macOS endpoints that may exercise the vulnerable code path
Monitoring Recommendations
- Ingest macOS Unified Log and crash reporter data into a centralized logging platform for fleet-wide analysis
- Alert on abnormal spikes in kernel panics or system termination events across managed Apple devices
- Track OS version compliance and identify endpoints still running vulnerable builds
How to Mitigate CVE-2026-84602
Immediate Actions Required
- Update all Apple devices to the fixed versions: iOS/iPadOS 26.7 or 27, macOS Sequoia 15.8, macOS Tahoe 26.7, macOS Golden Gate 27, tvOS 27, visionOS 27, and watchOS 27
- Prioritize patching macOS endpoints that permit installation of third-party applications
- Enforce OS update compliance through mobile device management policies
Patch Information
Apple has released security updates addressing CVE-2026-84602 across its platform portfolio. Consult the vendor advisories for the exact fixed builds per platform: Apple Security Advisory #149034, #149035, #149036, #149037, #149038, #149041, #149042, and #149043.
Workarounds
- No vendor-supplied workaround is documented; applying the security update is the recommended remediation
- Restrict installation of untrusted applications on macOS through Gatekeeper and application allowlisting until patches are deployed
- Limit local access to shared or multi-user Apple devices where possible to reduce exposure
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
