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?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2009-4027 patch availability.

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

11 total

Showing 5 of 11 references View all on NVD

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?

Monitor the NIST NVD and your Linux distribution's security advisories for CVE-2009-4027 patch availability.
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.