CVE-2009-3527 json
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 priv…
published 2009-10-06 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3509
- cvss
- 6.9
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 46%
- public exploits
- 1
- Exploit-DB
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.
Patch / fix
Timeline
- Published
- First public exploit (EDB-9859)
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-9859 FreeBSD 6.4 - 'pipeclose()'/'knlist_cleardel()' Race Condition local, 2009-10-08
- securityfocus.com http://www.securityfocus.com/archive/1/506449 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 6.9 | AV:L/AC:M/Au:N/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
References
-
security.freebsd.org
/advisories/FreeBSD-SA-09:13.pipe.asc
vendor-advisory, patch
-
securitytracker.com
/id?1022982
vdb-entry, patch
-
securityfocus.com
/bid/36375
vdb-entry, patch
-
securityfocus.com
/archive/1/506449
mailing-list, exploit
-
osvdb.org
/58544
vdb-entry
Sources
- CVE List CVE-2009-3527
- NVD CVE-2009-3527
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.