CVE-2009-3527 — 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

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MEDIUM

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

Published Oct 6, 2009

6.9

MEDIUM

CVSS 2.0

EPSS 0.55%

Description

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

0.55% 0.00554

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00554

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (11 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.55% (0.00554)	44.20th	v5 (v2026.06.15)
Jun 15, 2026	0.55% (0.00554)	41.66th	v5 (v2026.06.15)
Mar 17, 2025	0.08% (0.00085)	22.46th	v4 (v2025.03.14)
Dec 12, 2024	0.04% (0.00043)	11.52th	v3 (v2023.03.01)
Apr 17, 2024	0.04% (0.00045)	14.44th	v3 (v2023.03.01)
Feb 8, 2024	0.04% (0.00045)	12.42th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00043)	7.57th	v3 (v2023.03.01)
Mar 6, 2023	1.76% (0.01761)	76.53th	v2 (v2022.01.01)
Feb 23, 2023	1.76% (0.01761)	76.48th	v2 (v2022.01.01)
Apr 1, 2022	1.76% (0.01761)	74.44th	v2 (v2022.01.01)
Feb 4, 2022	1.76% (0.01761)	53.69th	v2 (v2022.01.01)

Weaknesses (1)

CWE-362

Race Condition

References (5)

http://osvdb.org/58544
vdb-entryx_refsource_OSVDB
http://security.freebsd.org/advisories/FreeBSD-SA-09:13.pipe.asc
vendor-advisoryx_refsource_FREEBSDPatch
http://www.securityfocus.com/archive/1/506449
mailing-listx_refsource_BUGTRAQExploit
http://www.securityfocus.com/bid/36375
vdb-entryx_refsource_BIDPatch
http://www.securitytracker.com/id?1022982
vdb-entryx_refsource_SECTRACKPatch

Link	Providers	Tags
http://osvdb.org/58544		vdb-entryx_refsource_OSVDB
http://security.freebsd.org/advisories/FreeBSD-SA-09:13.pipe.asc		vendor-advisoryx_refsource_FREEBSDPatch
http://www.securityfocus.com/archive/1/506449		mailing-listx_refsource_BUGTRAQExploit
http://www.securityfocus.com/bid/36375		vdb-entryx_refsource_BIDPatch
http://www.securitytracker.com/id?1022982		vdb-entryx_refsource_SECTRACKPatch

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Oct 6, 2009

Updated Sep 17, 2024

Reserved Oct 2, 2009

Link CVE-2009-3527

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2009-3527

Red Hat

Severity n/a

Public date n/a

Links CVE-2009-3527