# CVE-2009-0834: Security feature bypass in n/a

> Local attackers can bypass syscall audit configurations on x86_64 Linux kernels by crafting mismatched 32-bit and 64-bit syscalls.

- **Severity:** Low 3.6 (`AV:L/AC:L/Au:N/C:P/I:P/A:N`)
- **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:** 6 Mar 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-3cv7-5j4c-h696

## What is CVE-2009-0834?

CVE-2009-0834 is a low-severity vulnerability in Canonical Ubuntu Linux, published on 6 Mar 2009. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The audit_syscall_entry function in the Linux kernel 2.6.28.7 and earlier on the x86_64 platform does not properly handle (1) a 32-bit process making a 64-bit syscall or (2) a 64-bit process making a 32-bit syscall, which allows local users to bypass certain syscall audit configurations via crafted syscalls, a related issue to CVE-2009-0342 and CVE-2009-0343.

## Which versions are affected by CVE-2009-0834?

It affects 12 products.


Products: 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 Server Aus, Redhat Enterprise Linux Workstation, Suse Linux Enterprise Desktop, Suse Linux Enterprise Server, Suse Linux Enterprise Software Development Kit.

## How do I fix CVE-2009-0834?

Apply the vendor's patch.

## Is CVE-2009-0834 being exploited?

There is no known exploitation of CVE-2009-0834 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-0834 and fix it if it is affected.

What it is: CVE-2009-0834 is a low-severity vulnerability in Canonical Ubuntu Linux, published on 6 Mar 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-2009-0834 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-2009-0834/ (Markdown: https://insights.sbomify.com/CVE-2009-0834/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-0834
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-0834
- OSV: https://osv.dev/vulnerability/CVE-2009-0834

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-0834/
Summaries are generated and may contain mistakes; the official description above is the record.