CVE-2026-20620
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in macOS kernel memory that could allow an attacker to cause system crashes or read sensitive kernel data. It affects macOS systems running vulnerable versions of Sequoia, Tahoe, and Sonoma. The vulnerability requires local access to exploit.
💻 Affected Systems
- macOS
📦 What is this software?
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 cause kernel panic leading to system denial-of-service, or potentially read sensitive kernel memory that might contain credentials or other protected data.
Likely Case
Local privilege escalation or system instability/crashes from malicious applications exploiting the vulnerability.
If Mitigated
With proper patch management and least privilege controls, impact is limited to potential system crashes without data compromise.
🎯 Exploit Status
Exploitation requires local access and knowledge of kernel memory layout. No public exploits are currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Sequoia 15.7.4, macOS Tahoe 26.3, macOS Sonoma 14.8.4
Vendor Advisory: https://support.apple.com/en-us/126348
Restart Required: Yes
Instructions:
1. Open System Settings > General > Software Update. 2. Install available updates. 3. Restart the system when prompted.
🔧 Temporary Workarounds
Restrict local user privileges
macOSLimit local user accounts to standard user privileges to reduce attack surface
🧯 If You Can't Patch
- Implement strict access controls to limit who has local login access to affected systems
- Monitor systems for unexpected crashes or kernel panics as potential exploitation indicators
🔍 How to Verify
Check if Vulnerable:
Check macOS version in System Settings > General > About. If version is earlier than Sequoia 15.7.4, Tahoe 26.3, or Sonoma 14.8.4, system is vulnerable.Check Version:
sw_versVerify Fix Applied:
Verify macOS version shows Sequoia 15.7.4, Tahoe 26.3, or Sonoma 14.8.4 or later in System Settings > General > About.📡 Detection & Monitoring
Log Indicators:
- Kernel panics in system.log
- Unexpected system restarts
- Crash reports in /Library/Logs/DiagnosticReports
Network Indicators:
- No network indicators - this is a local vulnerability
SIEM Query:
source="macos_system_logs" AND ("kernel panic" OR "unexpected reboot" OR "system crash")