# CVE-2018-17154: Null dereference in FreeBSD

> Unprivileged local users can cause a denial of service via a NULL pointer dereference in the freebsd4_getfsstat system call.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:** No
- **Published:** 28 Sep 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-g38r-jrv6-p75p

## What is CVE-2018-17154?

CVE-2018-17154 is a medium-severity vulnerability in Freebsd Freebsd, published on 28 Sep 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In FreeBSD before 11.2-STABLE(r338987), 11.2-RELEASE-p4, and 11.1-RELEASE-p15, due to insufficient memory checking in the freebsd4_getfsstat system call, a NULL pointer dereference can occur. Unprivileged authenticated local users may be able to cause a denial of service.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2018-17154?

It affects 1 product.


Products: Freebsd Freebsd.

## How do I fix CVE-2018-17154?

No fix has been published for CVE-2018-17154 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-17154 being exploited?

There is no known exploitation of CVE-2018-17154 in the wild and no public exploit code.

## Other vulnerabilities in Freebsd Freebsd

- [CVE-2018-17160](https://insights.sbomify.com/CVE-2018-17160/): Memory corruption in FreeBSD (critical 10.0)
- [CVE-2014-3954](https://insights.sbomify.com/CVE-2014-3954/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-4304](https://insights.sbomify.com/CVE-2006-4304/): Memory corruption in n/a (critical 10.0)
- [CVE-2006-0226](https://insights.sbomify.com/CVE-2006-0226/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0002](https://insights.sbomify.com/CVE-2004-0002/): Denial of service in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-17154 and fix it if it is affected.

What it is: CVE-2018-17154 is a medium-severity vulnerability in Freebsd Freebsd, published on 28 Sep 2018. 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-2018-17154 in the wild and no public exploit code.

Affected product: Freebsd Freebsd. 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-2018-17154/ (Markdown: https://insights.sbomify.com/CVE-2018-17154/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-17154
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-17154
- OSV: https://osv.dev/vulnerability/CVE-2018-17154

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-17154/
Summaries are generated and may contain mistakes; the official description above is the record.