CVE-2009-1235: Apple Mac OS X

High severity, CVSS 7.2. EPSS: 1% chance of exploitation in the next 30 days.

XNU 1228.9.59 and earlier on Apple Mac OS X 10.5.6 and earlier does not properly restrict interaction between user space and the HFS IOCTL handler, which allows local users to overwrite kernel memory and gain privileges by attaching an HFS+ disk image and performing certain steps involving HFS_GET_BOOT_INFO fcntl calls.

Affected products

• Apple Mac OS X: up to and including 10.5.6; version 10.0 only; version 10.0.0 only; version 10.0.1 only; version 10.0.2 only; version 10.0.3 only; …
• Apple Mac OS X Server: up to and including 10.5.6; version 10.0 only; version 10.0.0 only; version 10.0.1 only; version 10.0.2 only; version 10.0.3 only; …

Published 2009-04-02. Last modified 2026-06-16.