CVE-2026-28986 Overview
CVE-2026-28986 is a race condition vulnerability affecting multiple Apple operating systems, including iOS, iPadOS, macOS, tvOS, and watchOS. The flaw allows a malicious application to trigger unexpected system termination, resulting in a denial-of-service condition on affected devices. Apple addressed the issue through additional validation in the affected code paths.
The vulnerability is classified under [CWE-362] (Concurrent Execution using Shared Resource with Improper Synchronization). It carries a network attack vector with no privileges or user interaction required, though impact is limited to availability.
Critical Impact
An application can exploit the race condition to cause unexpected system termination across iOS, iPadOS, macOS, tvOS, and watchOS, disrupting device availability.
Affected Products
- Apple iOS and iPadOS (fixed in 18.7.9 and 26.5)
- Apple macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5
- Apple tvOS 26.5 and watchOS 26.5
Discovery Timeline
- 2026-05-11 - CVE-2026-28986 published to NVD
- 2026-05-12 - Last updated in NVD database
Technical Details for CVE-2026-28986
Vulnerability Analysis
The vulnerability is a race condition in Apple operating system components. Race conditions occur when two or more threads access shared resources without proper synchronization. The resulting non-deterministic behavior can leave the system in an inconsistent state.
In this case, the inconsistent state leads to unexpected system termination. An attacker who can run an application on the target device can trigger the condition reliably enough to crash the operating system. Apple resolved the issue by adding validation logic to enforce correct ordering and state checks.
The Exploit Prediction Scoring System (EPSS) currently places this issue in the low-likelihood range for near-term exploitation. No public proof-of-concept code or active exploitation has been reported.
Root Cause
The root cause is improper synchronization of concurrent operations on a shared resource [CWE-362]. When timing windows align, the affected code path reaches an invalid state that the kernel cannot recover from, forcing termination. Apple's patch introduces additional validation to detect or prevent the unsafe state transition.
Attack Vector
The attack vector is network-adjacent in CVSS terms, but practical exploitation requires a malicious or compromised application running on the device. Once installed, the application can repeatedly invoke the vulnerable API to win the race and trigger system termination. Confidentiality and integrity are not impacted; only availability is affected.
No public exploitation code is available for CVE-2026-28986. Refer to the Apple Security Advisory #127110 and related advisories for component-specific technical context.
Detection Methods for CVE-2026-28986
Indicators of Compromise
- Repeated unexpected reboots or kernel panics on iOS, iPadOS, macOS, tvOS, or watchOS devices running pre-patch versions.
- Crash reports referencing the affected subsystem in /Library/Logs/DiagnosticReports/ on macOS or in iOS diagnostic logs.
- Recently installed third-party applications immediately preceding system termination events.
Detection Strategies
- Inventory all Apple endpoints and compare installed OS versions against the patched builds listed in the Apple advisories.
- Correlate application install events with subsequent crash or reboot telemetry to identify suspicious applications.
- Review MDM compliance reports to flag devices that have not received the security update.
Monitoring Recommendations
- Forward macOS and iOS crash diagnostics to a centralized log platform for analysis.
- Alert on patterns of repeated unexpected shutdowns across managed Apple fleets.
- Track application provenance and entitlements to spot apps invoking unusual system APIs.
How to Mitigate CVE-2026-28986
Immediate Actions Required
- Update affected devices to iOS 18.7.9, iPadOS 18.7.9, iOS 26.5, iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5, tvOS 26.5, or watchOS 26.5.
- Enforce automatic updates through Mobile Device Management (MDM) for managed Apple endpoints.
- Remove untrusted applications and restrict installation to vetted sources via configuration profiles.
Patch Information
Apple released patches across the affected operating systems. See the Apple Security Advisory #127110, Advisory #127111, Advisory #127115, Advisory #127116, Advisory #127117, Advisory #127118, and Advisory #127119 for the specific builds applicable to each platform.
Workarounds
- Limit application installation to the official App Store and require developer notarization on macOS.
- Use MDM policies to block unknown or unsigned applications until patches are deployed.
- Monitor crash telemetry and isolate devices exhibiting repeated unexpected terminations until updated.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
