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CVE-2009-4067· NVD / CVE Program· CNA mitre

Buffer overflow in the auerswald_probe function in the Auerswald Linux USB driver for the Linux kernel before 2.6.27 allows physically proxi

Noroxi assessment

Priority: Monitor (action score 28/100)

  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2% (FIRST EPSS); higher than 80.9% of all records.
  • Physical access to the device is required. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: linux-2.6 (Debian:5.0) 2.6.26-26lenny4; kernel (Red Hat:enterprise_linux:5::client) 0:2.6.18-274.7.1.el5; kernel-debug (Red Hat:enterprise_linux:5::client) 0:2.6.18-274.7.1.el5.

Low priority for now. Upgrade to linux-2.6 (Debian:5.0) 2.6.26-26lenny4; kernel (Red Hat:enterprise_linux:5::client) 0:2.6.18-274.7.1.el5; kernel-debug (Red Hat:enterprise_linux:5::client) 0:2.6.18-274.7.1.el5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.8 · v3.1—Proof of concept Fix available
Published
Feb 11, 2020
Updated
Jun 16, 2026
EPSS
2.0% · 80th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
27 / 40 · 6.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2009-4067

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 2.6.27
  • redhat enterprise linux4.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:5.0linux-2.6before 2.6.26-26lenny42.6.26-26lenny4
Red Hat:enterprise_linux:5::clientkernelbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debugbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debug-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debug-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debuginfo-commonbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-docbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAEbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAE-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAE-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-xenbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-xen-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-xen-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::serverkernel-kdumpbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::serverkernel-kdump-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::serverkernel-kdump-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux-2.62.6.26-26lenny4 · Debian:5.0Package registry (OSV)
red hat:kernel0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug-debuginfo0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug-devel0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debuginfo0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debuginfo-common0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-devel0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-doc0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE-debuginfo0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE-devel0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-xen0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrydos2009-10-19

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-3768 d
  2. Published
  3. TodayOct 15, 2026+2438 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Physical access to the device is required.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Physical
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

CVSS vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
char buf[256];memcpy(buf, pkt->data, pkt->len);

Fixed

c
char buf[256];if (pkt->len > sizeof(buf)) {  return -EINVAL;}memcpy(buf, pkt->data, pkt->len);

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records