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HighGood L.

PHP-FPM Worker Crash Thrashing (PHP2Shell Exploit Heap Grooming)

Detects abnormal velocity of PHP-FPM child worker respawns from the master process. Rapid worker recycling indicates repeated memory exhaustion (zend_bailout) or segmentation faults (SIGSEGV) characteristic of…

Description

Detects abnormal velocity of PHP-FPM child worker respawns from the master process. Rapid worker recycling indicates repeated memory exhaustion (zend_bailout) or segmentation faults (SIGSEGV) characteristic of Use-After-Free heap grooming and exploitation attempts (CVE-2026-109618 / CVE-2026-109619).

Detection logic

Detection requirements

Platform
ContainersESXiIaaSLinuxmacOSNetwork DevicesWindows

The rule states no platform. This is derived from the 0 ATT&CK techniques it maps to.

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