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CVE-2009-3527

MediumPublished

Race condition in the Pipe (IPC) close function in FreeBSD 6.3 and 6.4 allows local users to cause a denial of service (crash) or gain privileges via...

Published: Oct 6, 2009
Updated: Sep 17, 2024
Assigning CNA: mitre
Evidence observed: Oct 8, 2009

Primary CVSS

6.9/ 10Medium

nvd · CVSS 2.0

AV:L/AC:M/Au:N/C:C/I:C/A:C

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 44.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Race condition in the Pipe (IPC) close function in FreeBSD 6.3 and 6.4 allows local users to cause a denial of service (crash) or gain privileges via vectors related to kqueues, which triggers a use after free, leading to a NULL pointer dereference or memory corruption.

Sources

FreeBSD 6.4 - 'pipeclose()'/'knlist_cleardel()' Race ConditionExploit
Przemyslaw Frasunek · freebsd · Oct 8, 2009

Responsible use

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