CVE-2019-6493: Iobit Smart Defrag

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

SmartDefragDriver.sys (2.0) in IObit Smart Defrag 6 never frees an executable kernel pool that is allocated with user defined bytes and size when IOCTL 0x9C401CC0 is called. This kernel pointer can be leaked if the kernel pool becomes a "big" pool.

Affected products

• Iobit Smart Defrag: version 6 only

Published 2019-04-11. Last modified 2026-06-17.