CVE-2026-84507 Overview
CVE-2026-84507 is a race condition vulnerability [CWE-362] affecting multiple Apple operating systems. The flaw allows a local application to trigger unexpected system termination or corrupt kernel memory. Apple addressed the issue with improved state handling across its platform lineup.
The vulnerability requires local access and low privileges but produces high-impact consequences on confidentiality, integrity, and availability. An app running on an affected device can exploit a timing window in kernel state management to destabilize the operating system or manipulate kernel memory contents.
Critical Impact
A malicious application can corrupt kernel memory or cause system termination on iOS, iPadOS, macOS, tvOS, visionOS, and watchOS devices.
Affected Products
- Apple iOS and iPadOS (fixed in iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27)
- Apple macOS (fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7)
- Apple tvOS 27, visionOS 27, watchOS 27
Discovery Timeline
- 2026-09-14 - CVE-2026-84507 published to NVD
- 2026-09-18 - Last updated in NVD database
Technical Details for CVE-2026-84507
Vulnerability Analysis
CVE-2026-84507 is classified as a race condition [CWE-362] within Apple's kernel. Race conditions occur when the correctness of code depends on the relative timing of concurrent operations. When two or more threads access shared kernel state without proper synchronization, an attacker can interleave operations to leave the kernel in an inconsistent state.
Apple's remediation notes describe the fix as "improved state handling," indicating that the pre-patch code path allowed concurrent operations to observe or modify shared state at moments when invariants were not enforced. Exploiting such a window can lead to memory corruption inside the kernel address space.
Root Cause
The root cause is insufficient synchronization on a shared kernel object or state variable. A local app can invoke kernel interfaces concurrently, causing time-of-check to time-of-use (TOCTOU) inconsistencies. The result is either an unexpected system termination (kernel panic) or corruption of kernel memory that a skilled attacker can weaponize toward privilege escalation.
Attack Vector
Exploitation requires a local attacker with the ability to run code on the device, such as through an installed application. No user interaction is needed once the malicious app executes. The attacker races legitimate kernel operations to force the vulnerable code path into an inconsistent state. Apple has not disclosed the specific kernel subsystem involved, and no public proof-of-concept is available.
See the Apple Support Document 149034 for vendor guidance.
Detection Methods for CVE-2026-84507
Indicators of Compromise
- Unexpected kernel panics or spontaneous device reboots on Apple endpoints, particularly recurring panics tied to a specific installed application.
- Panic logs referencing kernel subsystems accessed by an untrusted third-party app shortly before the crash.
- Newly installed or sideloaded applications making unusual volumes of low-level system calls.
Detection Strategies
- Collect and centralize macOS DiagnosticReports and iOS panic logs for review, correlating repeated panics with specific process identifiers.
- Monitor endpoint telemetry for applications performing rapid, concurrent invocation of kernel-facing APIs.
- Track OS build versions across the fleet and flag devices running builds earlier than the patched versions listed by Apple.
Monitoring Recommendations
- Alert on any Apple device that has not been updated to the patched OS versions after a defined grace period.
- Correlate application install events with subsequent kernel panic reports to identify suspect applications.
- Review Mobile Device Management (MDM) compliance reports for out-of-date OS versions across managed devices.
How to Mitigate CVE-2026-84507
Immediate Actions Required
- Update all Apple devices to the patched operating system versions listed in the Apple advisories.
- Restrict installation of untrusted or sideloaded applications on managed devices through MDM policy.
- Prioritize patching for devices used by privileged users or those holding sensitive data.
Patch Information
Apple fixed CVE-2026-84507 in iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27. Refer to the vendor advisories: Apple Support 149034, 149035, 149036, 149037, 149038, 149041, 149042, and 149043.
Workarounds
- No vendor-supplied workaround exists; applying the OS update is the only complete fix.
- Limit application installation to vetted sources such as the App Store and enforce app allowlists through MDM.
- Enforce Lockdown Mode on high-risk user devices where operationally feasible to reduce attack surface for untrusted code.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
