CVE-2009-4027 Race condition in n/a

What is CVE-2009-4027?

CVE-2009-4027 is a high-severity vulnerability in Linux kernel, published on 2 Dec 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-362

Which versions are affected by CVE-2009-4027?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2009-4027?

Upgrade to a fixed version.

Is CVE-2009-4027 being exploited?

There is no known exploitation of CVE-2009-4027 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-239g-crqj-qcfp.