# CVE-2020-24863: Memory corruption in n/a

> An attacker can crash the system by triggering an invalid free in the kernel via crafted size and mode values.

- **Severity:** Medium 5.5 (`CVSS:3.1/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:** 3 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-qjw3-35px-c96q

## What is CVE-2020-24863?

CVE-2020-24863 is a medium-severity memory corruption vulnerability in Freebsd Freebsd, published on 3 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A memory corruption vulnerability was found in the kernel function kern_getfsstat in MidnightBSD before 1.2.7 and 1.3 through 2020-08-19, and FreeBSD through 11.4, that allows an attacker to trigger an invalid free and crash the system via a crafted size value in conjunction with an invalid mode.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2020-24863?

It affects 2 products.


Products: Freebsd Freebsd, Midnightbsd Midnightbsd.

## How do I fix CVE-2020-24863?

No fix has been published for CVE-2020-24863 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-24863 being exploited?

There is no known exploitation of CVE-2020-24863 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-2020-24863 and fix it if it is affected.

What it is: CVE-2020-24863 is a medium-severity memory corruption vulnerability in Freebsd Freebsd, published on 3 Sep 2020. 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-2020-24863 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-2020-24863/ (Markdown: https://insights.sbomify.com/CVE-2020-24863/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-24863
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-24863
- OSV: https://osv.dev/vulnerability/CVE-2020-24863

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-24863/
Summaries are generated and may contain mistakes; the official description above is the record.