CVE-2026-84492 Overview
CVE-2026-84492 is a race condition vulnerability [CWE-362] affecting multiple Apple operating systems. The flaw allows a local application to trigger unexpected system termination, resulting in a denial-of-service condition on affected devices. Apple addressed the issue with improved state handling across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.
The vulnerability requires local access and low privileges but has high attack complexity, limiting practical exploitation. Successful exploitation impacts availability without compromising confidentiality or integrity.
Critical Impact
A malicious or malformed application running locally can trigger a race condition that terminates the system unexpectedly, disrupting device availability across Apple's product ecosystem.
Affected Products
- Apple iOS and iPadOS (fixed in 26.7 and 27)
- Apple macOS (fixed in Sequoia 15.8, Tahoe 26.7, and Golden Gate 27)
- Apple tvOS 27, visionOS 27, and watchOS 27
Discovery Timeline
- 2026-09-14 - CVE-2026-84492 published to the National Vulnerability Database
- 2026-09-16 - Last updated in NVD database
Technical Details for CVE-2026-84492
Vulnerability Analysis
The vulnerability is a race condition [CWE-362] within an Apple operating system component shared across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. A race condition occurs when the behavior of software depends on the relative timing of concurrent operations that access shared state without proper synchronization.
In this case, an application can manipulate concurrent execution paths in a way that leaves the system in an inconsistent state. The result is an unexpected system termination, which forces a reboot or halts availability of the affected device. Apple's advisory attributes the fix to improved state handling, indicating that the affected code path lacked proper synchronization or atomic state transitions.
Exploitation is limited to a denial-of-service outcome. There is no reported memory disclosure, privilege escalation, or code execution associated with this identifier.
Root Cause
The root cause is insufficient state management during concurrent operations. Apple's remediation notes explicitly describe the fix as "improved state handling," which is consistent with a Time-of-Check to Time-of-Use (TOCTOU) or atomicity violation pattern where multiple threads or contexts modify shared state without adequate locking.
Attack Vector
The attack vector is local. An attacker must be able to run an application on the target device. The application invokes the vulnerable code path repeatedly or under specific timing conditions to win the race, causing the kernel or a privileged system component to terminate. High attack complexity indicates that reliably triggering the race requires precise timing control.
No exploit code, proof-of-concept, or in-the-wild exploitation has been reported. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-84492
Indicators of Compromise
- Unexpected system reboots or kernel panics on Apple devices without a corresponding hardware or software fault.
- Repeated crash reports referencing the same process or system component across multiple devices.
- Recently installed or sideloaded applications that correlate in time with unexplained device restarts.
Detection Strategies
- Review MDM and endpoint telemetry for crash reports and reboot events on iOS, iPadOS, macOS, tvOS, visionOS, and watchOS endpoints.
- Correlate application installation and execution events with system termination timestamps.
- Monitor macOS ReportCrash diagnostic logs and iOS analytics data for repeated panic signatures.
Monitoring Recommendations
- Aggregate Apple device crash and reboot telemetry into a central logging platform for anomaly detection.
- Establish baselines for expected reboot frequency per device class and alert on statistically significant deviations.
- Track OS version distribution across the fleet to identify devices still running vulnerable builds.
How to Mitigate CVE-2026-84492
Immediate Actions Required
- Update Apple devices to the fixed versions: iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Sequoia 15.8, macOS Tahoe 26.7, macOS Golden Gate 27, tvOS 27, visionOS 27, and watchOS 27.
- Enforce update deployment through mobile device management (MDM) policies for managed fleets.
- Restrict installation of untrusted applications, particularly on devices running unpatched OS versions.
Patch Information
Apple has released patches for all affected platforms. Refer to the vendor advisories for platform-specific details: Apple Support Article #149034, Apple Support Article #149035, Apple Support Article #149036, Apple Support Article #149037, Apple Support Article #149038, Apple Support Article #149041, Apple Support Article #149042, and Apple Support Article #149043.
Workarounds
- No official workaround has been published; applying the vendor patch is the recommended remediation.
- Limit the ability of low-trust users and applications to execute on affected devices until patches are deployed.
- Enable automatic updates on Apple devices to reduce exposure window for future advisories.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
