What is CVE-2009-4067?

CVE-2009-4067 is a medium-severity vulnerability in Linux Kernel, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.8/10. Published 2020-02-11.

How severe is CVE-2009-4067?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Buffer overflow in Linux Kernel

CVE-2009-4067

Buffer overflow in the auerswald_probe function in the Auerswald Linux USB driver for the Linux kernel before 2.6.27 allows physically proximate attackers to execute arbitrary code, cause a denial of service via a crafted USB device, or take full control of the system.

Vulnerability class: Buffer Overflow

Published 2020-02-11 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.6th percentile), scored 2026-09-28.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Linux Kernel
Red Hat Enterprise Linux — versions 4.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

labs.mwrinfosecurity.com/files/Advisories/mwri_linux-usb-buffer-overflow_2009-1… (Technical Description, Exploit, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2009-4067?: CVE-2009-4067 is a medium-severity vulnerability in Linux Kernel, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.8/10. Published 2020-02-11.
How severe is CVE-2009-4067?: Medium severity. CVSS v3 base score is 6.8 out of 10.