Public Date:
541149: CVE-2009-4026 CVE-2009-4027 kernel: mac80211: fix spurious delBA handling

The MITRE CVE dictionary describes this issue as:

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.

Find out more about CVE-2009-4027 from the MITRE CVE dictionary dictionary and NIST NVD.


Red Hat is aware of this issue and is tracking it via the following bug: This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 3 and 4 as they do not have support for the mac80211 framework. It did not affect the version of the Linux kernel as shipped with Red Hat Enterprise MRG as they do not include the upstream patch that introduced this vulnerability. A future update will address this flaw in Red Hat Enterprise Linux 5.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 7.8
Base Metrics AV:N/AC:L/Au:N/C:N/I:N/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux EUS (v. 5.4 server) (kernel) RHSA-2010:0380 2010-04-27
Red Hat Enterprise Linux version 5 (kernel) RHSA-2010:0178 2010-03-29