# CVE-2006-4435: Denial of service in n/a

> A local attacker can cause a kernel panic and denial of service in OpenBSD by allocating more semaphores than the default limit.

- **Severity:** Medium 4.9 (`AV:L/AC:L/Au:N/C:N/I:N/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:** No
- **Published:** 29 Aug 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-5rvr-prhw-cr2q

## What is CVE-2006-4435?

CVE-2006-4435 is a medium-severity denial of service vulnerability in Openbsd Openbsd, published on 29 Aug 2006. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

OpenBSD 3.8, 3.9, and possibly earlier versions allows context-dependent attackers to cause a denial of service (kernel panic) by allocating more semaphores than the default.

## Which versions are affected by CVE-2006-4435?

It affects 1 product.


Products: Openbsd Openbsd.

## How do I fix CVE-2006-4435?

No fix has been published for CVE-2006-4435 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-4435 being exploited?

There is no known exploitation of CVE-2006-4435 in the wild and no public exploit code.

## Other vulnerabilities in Openbsd Openbsd

- [CVE-2007-1365](https://insights.sbomify.com/CVE-2007-1365/): Memory corruption in n/a (critical 10.0)
- [CVE-2004-0220](https://insights.sbomify.com/CVE-2004-0220/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0083](https://insights.sbomify.com/CVE-2004-0083/): Memory corruption in n/a (critical 10.0)
- [CVE-2004-0084](https://insights.sbomify.com/CVE-2004-0084/): Memory corruption in n/a (critical 10.0)
- [CVE-2001-0284](https://insights.sbomify.com/CVE-2001-0284/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-4435 and fix it if it is affected.

What it is: CVE-2006-4435 is a medium-severity denial of service vulnerability in Openbsd Openbsd, published on 29 Aug 2006. 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-2006-4435 in the wild and no public exploit code.

Affected product: Openbsd Openbsd. 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-2006-4435/ (Markdown: https://insights.sbomify.com/CVE-2006-4435/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-4435
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-4435
- OSV: https://osv.dev/vulnerability/CVE-2006-4435

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-4435/
Summaries are generated and may contain mistakes; the official description above is the record.