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Fencer Vulns
high 7.2

CVE-2009-1235 json

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…

published 2009-04-02 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1234

cvss
7.2
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
1
Exploit-DB

Summary

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.

Timeline

  1. First public exploit (EDB-8266)
  2. Published

Exploit prediction

0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-8266 Apple Mac OSX xnu 1228.x - 'hfs-fcntl' Kernel Privilege Escalation local, 2009-03-23
  • digit-labs.org http://www.digit-labs.org/files/exploits/xnu-hfs-fcntl-v2.c referenced PoC, tagged "exploit" by a source, unverified
  • digit-labs.org http://www.digit-labs.org/files/exploits/xnu-hfs-fcntl-v2.sh referenced PoC, tagged "exploit" by a source, unverified
  • securityfocus.com http://www.securityfocus.com/bid/34203 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.