CVE-2026-20621
📋 TL;DR
This CVE describes a memory corruption vulnerability in Apple operating systems that allows an app to cause system crashes or corrupt kernel memory. It affects multiple macOS, iOS, iPadOS, and visionOS versions. The vulnerability could lead to denial of service or potentially arbitrary code execution with kernel privileges.
💻 Affected Systems
- macOS
- iOS
- iPadOS
- visionOS
📦 What is this software?
Ipados by Apple
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →⚠️ Risk & Real-World Impact
Worst Case
An attacker could achieve kernel-level arbitrary code execution, potentially gaining full system control, installing persistent malware, or bypassing all security controls.
Likely Case
Most probable impact is denial of service through system crashes or instability, potentially causing data loss or service disruption.
If Mitigated
With proper application sandboxing and least privilege principles, impact would be limited to denial of service within the affected application's context.
🎯 Exploit Status
Exploitation requires a malicious or compromised application to be installed and executed on the target system. No known public exploits at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Tahoe 26.3, macOS Sonoma 14.8.4, macOS Sequoia 15.7.4, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3
Vendor Advisory: https://support.apple.com/en-us/126346
Restart Required: Yes
Instructions:
1. Open System Settings > General > Software Update. 2. Install available updates for your operating system. 3. Restart your device when prompted.
🔧 Temporary Workarounds
Application Restriction
allRestrict installation of untrusted applications through MDM or parental controls
🧯 If You Can't Patch
- Implement strict application allowlisting to prevent untrusted apps from executing
- Isolate vulnerable systems in network segments with limited access
🔍 How to Verify
Check if Vulnerable:
Check current OS version against affected versions listCheck Version:
macOS: sw_vers -productVersion, iOS/iPadOS: Settings > General > About > VersionVerify Fix Applied:
Verify OS version matches or exceeds patched versions listed📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Unexpected system restarts
- Application crash reports referencing kernel memory
Network Indicators:
- None - local exploitation only
SIEM Query:
source="kernel" AND ("panic" OR "memory corruption" OR "unexpected termination")