CVE-2009-4027

Severity: high (CVSS 7.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-12-02 · updated 2026-06-16
Weakness: CWE-362

Description

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.

Affected products

Linux kernel: through 2.6.32; 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5 (+328)

References

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

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