What is CVE-2009-4027?

CVE-2009-4027 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, classified as a Race Condition flaw (CWE-362). CVE-2009-4027 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2009-4027?

CVE-2009-4027 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is AV:N/AC:M/Au:N/C:N/I:N/A:C.

Is there a patch available for CVE-2009-4027?

No patch is currently available for CVE-2009-4027. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2009-4027 actively exploited?

CVE-2009-4027 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/362.html

CVE-2009-4027

High

Race condition in the mac80211 subsystem in the Linux kernel before 2.6.32-rc8-next-20091201 allows remote attackers to cause a denial of service (system crash) via a Delete Block ACK (aka DELBA) packet that triggers a certain state change in the absence of an aggregation session.

Package Linux Kernel

Published 2009-12-02

Last modified 2026-04-23

CVSS version 2.0

Patch available

Awaiting data

CVSS 2.0 score

7.1

out of 10

High

Attack Vector

Network

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

None

Integrity

None

Availability

Vector string

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

Weakness type

CWE-362

CVE-2009-4027 is a Race Condition vulnerability

What is Race Condition?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2009-4027 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Lists
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
Secunia
http://secunia.com/advisories/38017
Secunia
http://secunia.com/advisories/38492
Debian Security
http://www.debian.org/security/2010/dsa-1996
Red Hat
http://www.redhat.com/support/errata/RHSA-2010-0380.html
Securityfocus
http://www.securityfocus.com/bid/37170
Ubuntu Security
http://www.ubuntu.com/usn/usn-864-1
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=541149
Oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11583
Kernel patch commit
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=827d42c9ac91ddd728e4f4a31fefb906ef2ceff7
Patch
Kernel patch commit
http://www.kernel.org/pub/linux/kernel/v2.6/next/patch-v2.6.32-rc8-next-20091201.gz
Patch

Details

CVE ID CVE-2009-4027

Severity High

CVSS score 7.1 / 10

CVSS version 2.0

Published 2009-12-02

Modified 2026-04-23

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2009-4027?

CVE-2009-4027 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 , classified as a Race Condition flaw (CWE-362) . CVE-2009-4027 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2009-4027?

CVE-2009-4027 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 2.0). The vector string is AV:N/AC:M/Au:N/C:N/I:N/A:C.
Is there a patch available for CVE-2009-4027?

No patch is currently available for CVE-2009-4027. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2009-4027 actively exploited?

No — CVE-2009-4027 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Race Condition (CWE-362)?

The product contains a code sequence that can run concurrently with other code, creating unexpected states. View CWE-362 on MITRE CWE →