# CVE-2020-25581: Race condition in FreeBSD

> A race condition in FreeBSD's jail_remove implementation may fail to kill processes, potentially leading to resource exhaustion or denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Mar 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-m73c-c6gx-rc72

## What is CVE-2020-25581?

CVE-2020-25581 is a high-severity vulnerability in Freebsd Freebsd, published on 26 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In FreeBSD 12.2-STABLE before r369312, 11.4-STABLE before r369313, 12.2-RELEASE before p4 and 11.4-RELEASE before p8 due to a race condition in the jail_remove(2) implementation, it may fail to kill some of the processes.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2020-25581?

It affects 1 product.


Products: Freebsd Freebsd.

## How do I fix CVE-2020-25581?

No fix has been published for CVE-2020-25581 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-25581 being exploited?

There is no known exploitation of CVE-2020-25581 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-2020-25581 and fix it if it is affected.

What it is: CVE-2020-25581 is a high-severity vulnerability in Freebsd Freebsd, published on 26 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-25581 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-2020-25581/ (Markdown: https://insights.sbomify.com/CVE-2020-25581/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-25581
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-25581
- OSV: https://osv.dev/vulnerability/CVE-2020-25581

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-25581/
Summaries are generated and may contain mistakes; the official description above is the record.