# CVE-2009-3939: Misconfiguration in n/a

> Local attackers can modify the megaraid_sas driver I/O mode due to world-writable permissions, potentially leading to privilege escalation or data modification.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Nov 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-3v99-jwxg-37h6

## What is CVE-2009-3939?

CVE-2009-3939 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 16 Nov 2009. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The poll_mode_io file for the megaraid_sas driver in the Linux kernel 2.6.31.6 and earlier has world-writable permissions, which allows local users to change the I/O mode of the driver by modifying this file.

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2009-3939?

It affects 18 products.


Products: Avaya Aura Application Enablement Services, Avaya Aura Communication Manager, Avaya Aura Session Manager, Avaya Aura Sip Enablement Services, Avaya Aura System Manager, Avaya Aura System Platform, Avaya Voice Portal, Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Opensuse Opensuse, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation, Redhat Virtualization, Suse Linux Enterprise Desktop, Suse Linux Enterprise Server.

## How do I fix CVE-2009-3939?

Apply the vendor's patch.

## Is CVE-2009-3939 being exploited?

There is no known exploitation of CVE-2009-3939 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2022-2975](https://insights.sbomify.com/CVE-2022-2975/): Avaya Aura Application Enablement Services weak permissions in web application (high 7.7)
- [CVE-2016-5285](https://insights.sbomify.com/CVE-2016-5285/): Null dereference in Network Security Services (high 7.5)
- [CVE-2006-1058](https://insights.sbomify.com/CVE-2006-1058/): Weak cryptography in n/a (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-3939 and fix it if it is affected.

What it is: CVE-2009-3939 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 16 Nov 2009. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2009-3939 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2009-3939/ (Markdown: https://insights.sbomify.com/CVE-2009-3939/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-3939
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-3939
- OSV: https://osv.dev/vulnerability/CVE-2009-3939

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-3939/
Summaries are generated and may contain mistakes; the official description above is the record.