# CVE-2009-2406: Memory corruption in n/a

> Local attackers can cause a system crash or potentially gain privileges via a crafted eCryptfs file due to a stack-based buffer overflow in the Linux kernel.

- **Severity:** Medium 6.9 (`AV:L/AC:M/Au:N/C:C/I:C/A:C`)
- **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:** 31 Jul 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-86jh-hvhg-x8w9

## What is CVE-2009-2406?

CVE-2009-2406 is a medium-severity memory corruption vulnerability in Linux kernel, published on 31 Jul 2009. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Stack-based buffer overflow in the parse_tag_11_packet function in fs/ecryptfs/keystore.c in the eCryptfs subsystem in the Linux kernel before 2.6.30.4 allows local users to cause a denial of service (system crash) or possibly gain privileges via vectors involving a crafted eCryptfs file, related to not ensuring that the key signature length in a Tag 11 packet is compatible with the key signature buffer size.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2009-2406?

It affects 2 products.


Products: Linux Kernel, Linux kernel.

## How do I fix CVE-2009-2406?

Upgrade to a fixed version.

## Is CVE-2009-2406 being exploited?

There is no known exploitation of CVE-2009-2406 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2009-2844](https://insights.sbomify.com/CVE-2009-2844/): Null dereference in n/a (high 7.8)
- [CVE-2009-1389](https://insights.sbomify.com/CVE-2009-1389/): Memory corruption in n/a (high 7.8)
- [CVE-2009-2767](https://insights.sbomify.com/CVE-2009-2767/): Null dereference in n/a (high 7.2)
- [CVE-2010-0309](https://insights.sbomify.com/CVE-2010-0309/): Denial of service in n/a (medium 6.8)
- [CVE-2009-2847](https://insights.sbomify.com/CVE-2009-2847/): Information disclosure in n/a (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-2406 and fix it if it is affected.

What it is: CVE-2009-2406 is a medium-severity memory corruption vulnerability in Linux kernel, published on 31 Jul 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-2009-2406 in the wild and no public exploit code.

Affected product: Linux kernel. 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-2009-2406/ (Markdown: https://insights.sbomify.com/CVE-2009-2406/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-2406
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-2406
- OSV: https://osv.dev/vulnerability/CVE-2009-2406

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-2406/
Summaries are generated and may contain mistakes; the official description above is the record.