Critical macOS Kernel Zero-Day Grants Full Root Control, Active Exploitation Confirmed

Apple has released emergency rapid security responses across macOS Sonoma and Sequoia to address an unauthenticated kernel privilege escalation zero-day (tracked as CVE-2026-4409) currently being exploited in targeted attack campaigns.

Anatomy of CVE-2026-4409 Memory Buffer Overflow

The vulnerability stems from a memory buffer flaw in the macOS IOKit graphics driver subsystem. By sending crafted memory requests, an attacker or sandbox-escaped binary can override kernel pointer checks, disarm TCC permissions, and take complete root control of the system.

System Integrity Protection Bypass and Immediate Patching

Security agencies strongly urge all Mac enterprise fleet admins and personal users to install the update immediately to block automated exploit payloads.