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Fencer Vulns
high 7.1

CVE-2009-4027 json

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 s…

published 2009-12-02 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3998

cvss
7.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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.

Patch / fix

  • kernel RHEL 5 2.6.18-194.el5
  • kernel-PAE RHEL 5 2.6.18-194.el5
  • kernel-xen RHEL 5 2.6.18-194.el5
  • kernel-kdump RHEL 5 2.6.18-194.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-194.el5
  • kernel RHEL 5.4 EUS 2.6.18-164.17.1.el5
  • kernel-PAE RHEL 5.4 EUS 2.6.18-164.17.1.el5
  • kernel-xen RHEL 5.4 EUS 2.6.18-164.17.1.el5

red hat advisories RHSA-2010:0380RHSA-2010:0178

  • kernel-source openSUSE Tumbleweed 4.8.13-1.1

opensuse advisories openSUSE-SU-2024:10128-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-4027 updated cvss 7.8

kernel: mac80211: fix spurious delBA handling

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-194.el5, kernel-PAE 2.6.18-194.el5, kernel-xen 2.6.18-194.el5, kernel-kdump 2.6.18-194.el5, kernel-debuginfo-common 2.6.18-194.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-194.el5, kernel-PAE 2.6.18-194.el5, kernel-xen 2.6.18-194.el5, kernel-kdump 2.6.18-194.el5, kernel-debuginfo-common 2.6.18-194.el5
    fixed: vendor fix RHSA-2010:0178
  • Red Hat Enterprise Linux EUS (v. 5.4 server) kernel 2.6.18-164.17.1.el5, kernel-PAE 2.6.18-164.17.1.el5, kernel-xen 2.6.18-164.17.1.el5, kernel-kdump 2.6.18-164.17.1.el5, kernel-debuginfo-common 2.6.18-164.17.1.el5
    fixed: vendor fix RHSA-2010:0380

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.29% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.