TI-2019-04550 Aliases CVE-2019-6493 GHSA-2h7h-j22f-v4p9

SmartDefragDriver.sys (2.0) in IObit Smart Defrag 6 never frees an executable kernel pool…

LOW 25CWE-401Published 2019-04-11 · Updated 2024-08-04

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-401.

Summary

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.

Why it matters now

EPSS 0.0049 42nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:iobit:smart_defrag:6:::::::*	6	Vulnerable	IObit

cpe:2.3:a:iobit:smart_defrag:6:*:*:*:*:*:*:* Versions 6 Vulnerable ·IObit

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2019-6493
2026-10-03 Alias added: GHSA-2h7h-j22f-v4p9

References

Exploit 1

https://downwithup.github.io/CVEPosts.html

Advisory 1

https://www.iobit.com/en/iobitsmartdefrag.php

TI-2019-04549 SmartDefragDriver.sys (2.0) in IObit Smart Defrag 6 never frees an executable kernel pool… CVSS 3.0MEDIUM 5.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences