CVE-2026-86924: Apple iPadOS Memory Corruption Vulnerability

CVE-2026-86924 Overview

CVE-2026-86924 is a memory corruption vulnerability affecting Apple iOS, iPadOS, and macOS. The flaw stems from improper input validation when the operating system processes data from a connected accessory. An attacker with physical access can trigger unexpected system termination by connecting a malicious accessory to a vulnerable device. Apple addressed the issue with improved input validation in iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Golden Gate 27, and macOS Tahoe 26.7. The vulnerability is tracked under [CWE-20] Improper Input Validation.

Critical Impact
Connecting a malicious accessory to a vulnerable Apple device can cause unexpected system termination, resulting in a denial-of-service condition on iPhone, iPad, and Mac systems.

Affected Products

Apple iOS (versions prior to iOS 26.7 and iOS 27)
Apple iPadOS (versions prior to iPadOS 26.7 and iPadOS 27)
Apple macOS (versions prior to macOS Tahoe 26.7 and macOS Golden Gate 27)

Discovery Timeline

2026-09-14 - CVE-2026-86924 published to the National Vulnerability Database
2026-09-18 - Last updated in NVD database

Technical Details for CVE-2026-86924

Vulnerability Analysis

The vulnerability resides in the accessory-handling code path within iOS, iPadOS, and macOS. When a device connects to an external accessory, the operating system parses data structures received from the peripheral. Insufficient validation of that input allows a crafted accessory to supply data that corrupts memory in the handling routine. The resulting corruption leads to unexpected system termination, affecting device availability. Apple's advisories describe the fix as improved input validation, indicating the patched code now rejects malformed input before it reaches vulnerable memory operations.

Root Cause

The root cause is improper input validation [CWE-20] in the accessory subsystem. Code responsible for parsing accessory-supplied data did not sufficiently verify the size, structure, or content of fields before using them in memory operations. This allowed a malicious peripheral to influence memory state in a way the developers did not anticipate.

Attack Vector

Exploitation requires local, physical access to the target device and user interaction to connect the malicious accessory. Once connected, the accessory delivers crafted data over the accessory interface, triggering the memory corruption. The impact is limited to availability; there is no confirmed loss of confidentiality or integrity. No public exploit or proof-of-concept has been published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

No verified proof-of-concept code is publicly available. Refer to the Apple security advisories for additional technical context.

Detection Methods for CVE-2026-86924

Indicators of Compromise

Unexpected kernel panics or system termination events shortly after an accessory is connected to an iPhone, iPad, or Mac.
Repeated crash reports in /Library/Logs/DiagnosticReports/ on macOS referencing accessory or USB-related subsystems.
Presence of unknown or unauthorized accessories connecting to managed Apple devices.

Detection Strategies

Monitor MDM telemetry for repeated device restarts or crash reports on iOS, iPadOS, and macOS endpoints.
Correlate accessory connection events with system termination events in endpoint logs to identify potential exploitation attempts.
Track operating system versions across the fleet to identify devices still running vulnerable builds prior to 26.7 and 27.

Monitoring Recommendations

Ingest macOS unified logs and iOS crash telemetry into a centralized analytics platform for correlation.
Alert on anomalous USB or Lightning accessory connections in high-risk environments such as executive or developer devices.
Review MDM inventory reports weekly to confirm patch adoption across all Apple endpoints.

How to Mitigate CVE-2026-86924

Immediate Actions Required

Update all iPhones to iOS 26.7 or iOS 27 as documented in Apple's security advisories.
Update all iPads to iPadOS 26.7 or iPadOS 27.
Update Macs to macOS Tahoe 26.7 or macOS Golden Gate 27.
Enforce patch deployment through MDM policies to accelerate remediation across the fleet.

Patch Information

Apple released fixes in iOS 26.7, iPadOS 26.7, iOS 27, iPadOS 27, macOS Golden Gate 27, and macOS Tahoe 26.7. Consult the vendor advisories for full details: Apple Support Article #149034, Apple Support Article #149035, Apple Support Article #149041, and Apple Support Article #149042.

Workarounds

Avoid connecting untrusted or unknown accessories to Apple devices until patches are applied.
Enable USB Restricted Mode on iOS and iPadOS to limit accessory access when the device is locked.
Use MDM restrictions to disable accessory connections on high-risk managed devices where feasible.

bash

# Verify installed iOS/iPadOS version on a managed device via MDM query
# Example: check that the OS build meets or exceeds the patched release
softwareupdate --history        # macOS: review update history
sw_vers -productVersion         # macOS: confirm version is 26.7 or later