CVE-2026-84630: Apple iPadOS Race Condition Vulnerability

CVE-2026-84630 Overview

CVE-2026-84630 is a race condition vulnerability [CWE-362] affecting multiple Apple operating systems. A local application can trigger the flaw to cause unexpected system termination. Apple addressed the issue with improved state handling across its platform portfolio.

The vulnerability requires local access and low privileges to exploit. It does not enable code execution, privilege escalation, or data disclosure. Impact is limited to availability, resulting in system crashes.

Critical Impact
A local app with low privileges can trigger a race condition that causes unexpected system termination across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS devices.

Affected Products

Apple iOS and iPadOS (prior to iOS 26.7/iPadOS 26.7 and iOS 27/iPadOS 27)
Apple macOS (Sequoia prior to 15.8, Tahoe prior to 26.7, Golden Gate prior to 27)
Apple tvOS, visionOS, and watchOS (prior to version 27)

Discovery Timeline

2026-09-14 - CVE-2026-84630 published to the National Vulnerability Database
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-84630

Vulnerability Analysis

CVE-2026-84630 is a race condition [CWE-362] within shared Apple operating system components. Concurrent execution paths access shared state without adequate synchronization. When two threads reach the affected code region in a specific interleaving, the state becomes inconsistent and triggers a fault that terminates the system.

Exploitation requires a local application already running on the device. The attack complexity is high because the attacker must reliably win a narrow timing window. Successful exploitation causes unexpected system termination, denying service to the device user.

The issue affects the full Apple platform family, indicating the vulnerable component is part of shared code reused across iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. Apple's advisories describe the fix as "improved state handling," a common remediation pattern for TOCTOU and atomicity violations.

Root Cause

The root cause is inadequate synchronization of shared state between concurrent execution contexts. Without atomic operations or locking primitives, one thread can observe or modify state that another thread is simultaneously changing. This inconsistency leads to invariant violations and triggers a kernel or system-level abort.

Attack Vector

An attacker with the ability to run an app on a target device can attempt to trigger the race by repeatedly invoking the vulnerable code path. Reliable exploitation requires precise timing and typically thread spraying to maximize the chance of hitting the vulnerable interleaving. Because the outcome is system termination, the vulnerability provides denial of service without further attacker leverage.

See the Apple security advisories for details specific to each platform release.

Detection Methods for CVE-2026-84630

Indicators of Compromise

Repeated unexpected system reboots or kernel panics on Apple devices coinciding with a specific app's execution.
Crash reports referencing the affected subsystem submitted to Apple diagnostics, particularly with race or synchronization-related backtraces.
Presence of unsigned or unexpected third-party apps that immediately precede system termination events.

Detection Strategies

Aggregate device crash telemetry from mobile device management (MDM) platforms to identify anomalous system termination patterns.
Correlate app installation events with subsequent panic logs to isolate suspect applications.
Monitor endpoint fleets for devices running Apple OS versions prior to the patched releases.

Monitoring Recommendations

Enroll Apple endpoints in MDM to collect OS version inventory and crash diagnostics.
Flag devices that have not upgraded to iOS/iPadOS 26.7, macOS Sequoia 15.8, macOS Tahoe 26.7, or the version 27 series across Apple platforms.
Track application behavior for repeated high-frequency system calls that may indicate race exploitation attempts.

How to Mitigate CVE-2026-84630

Immediate Actions Required

Update all Apple devices to the patched releases: 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.
Prioritize managed devices that run untrusted or sideloaded applications.
Audit installed applications and remove any that are unnecessary or of unverified origin.

Patch Information

Apple released fixes across all affected platforms. Refer to the vendor advisories for platform-specific patch details: Apple Security Advisory #149034, #149035, #149036, #149037, #149038, #149041, #149042, and #149043.

Workarounds

Restrict installation of untrusted third-party applications through MDM configuration profiles until patches are applied.
Enforce application allowlisting on managed macOS endpoints to limit local code execution.
Educate users to avoid running unverified applications on Apple devices pending remediation.