CVE-2026-64720: Apple iPadOS Race Condition Vulnerability

CVE-2026-64720 Overview

CVE-2026-64720 is a race condition vulnerability affecting multiple Apple operating systems, including iOS, iPadOS, macOS Tahoe, tvOS, and watchOS. The flaw exists in shared system state handling and allows a malicious application to trigger unexpected system termination on the target device. Apple resolved the issue through improved state handling in iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, and watchOS 26.6. The vulnerability is tracked under [CWE-362] (Concurrent Execution using Shared Resource with Improper Synchronization).

Critical Impact
A locally installed application can exploit the race condition to cause system-wide termination, disrupting device availability across Apple's consumer and enterprise device fleet.

Affected Products

Apple iOS and iPadOS prior to version 26.6
Apple macOS Tahoe prior to version 26.6
Apple tvOS and watchOS prior to version 26.6

Discovery Timeline

2026-07-27 - CVE-2026-64720 published to the National Vulnerability Database
2026-07-28 - Last updated in NVD database

Technical Details for CVE-2026-64720

Vulnerability Analysis

The vulnerability is a race condition [CWE-362] within Apple operating system components shared across iOS, iPadOS, macOS, tvOS, and watchOS. Concurrent threads access shared state without proper synchronization, producing an inconsistent state that the operating system cannot recover from. When triggered, the condition results in unexpected system termination.

Apple's advisories describe the fix as "improved state handling," indicating the patch introduces additional locking, ordering, or atomic operations around the affected shared resource. The consistent version alignment across five operating systems suggests the defect resides in a common component reused across Apple platforms, such as a kernel subsystem or shared framework.

Root Cause

The root cause is improper synchronization between concurrent execution paths that access the same resource. Under specific timing conditions, one thread modifies state while another reads or acts on it, leaving the system in an invalid configuration. The operating system responds by terminating to preserve integrity.

Attack Vector

Exploitation requires a malicious or compromised application running on the target device. The attacker-controlled app repeatedly invokes the vulnerable code path with the timing required to win the race. Successful exploitation crashes the device, producing a denial-of-service condition. No user interaction beyond running the malicious app is required. Refer to the Apple Security Advisory 128066 for vendor-specific technical context.

No verified proof-of-concept code is publicly available for CVE-2026-64720.
Apple has not released technical exploitation details beyond the advisory summary.

Detection Methods for CVE-2026-64720

Indicators of Compromise

Repeated unexpected system reboots or kernel panics on Apple devices running versions earlier than 26.6.
Crash reports referencing synchronization primitives, kernel assertions, or panic strings tied to shared-state handling.
Installation of unsigned, sideloaded, or newly enterprise-provisioned applications immediately preceding the crash pattern.

Detection Strategies

Aggregate Apple device crash telemetry through Mobile Device Management (MDM) and correlate spikes with recently installed applications.
Monitor macOS DiagnosticReports and iOS analytics logs for repeated panic entries citing lock or state assertions.
Track OS build versions across the fleet to identify endpoints still running pre-26.6 releases.

Monitoring Recommendations

Enable MDM-based OS version reporting and set alerts for devices below iOS/iPadOS/macOS/tvOS/watchOS 26.6.
Feed crash and diagnostic logs into a centralized analytics platform for cross-device correlation.
Flag applications from untrusted developer accounts or newly signed provisioning profiles for review.

How to Mitigate CVE-2026-64720

Immediate Actions Required

Update all affected devices to iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, or watchOS 26.6.
Enforce the update through MDM policies for enterprise-managed Apple devices.
Audit installed applications and remove any unsigned, sideloaded, or untrusted binaries.
Restrict enterprise provisioning profile installation to vetted developer accounts.

Patch Information

Apple published fixes in the following advisories: Apple Security Advisory 128066, Apple Security Advisory 128067, Apple Security Advisory 128068, and Apple Security Advisory 128069. The patched versions are iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, and watchOS 26.6.

Workarounds

No vendor-supplied workaround exists; upgrading to version 26.6 is the only supported remediation.
Limit application installation to the Apple App Store and vetted enterprise catalogs until patches are applied.
Use MDM to defer or block installation of untrusted third-party applications on unpatched devices.

bash

# Query macOS build version to verify patch status
sw_vers -productVersion

# Trigger managed software update on enrolled macOS devices
sudo softwareupdate --install --all --restart