# CVE-2021-25316: Local DoS of VM live migration due to use of static tmp files in detach_disks.sh in s390-tools

> Local attackers can prevent VM live migrations by exploiting insecure temporary files in the detach_disks.sh script within s390-tools.

- **Severity:** Low 3.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`)
- **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:** 14 Apr 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-xww5-ggv5-g549, SUSE-SU-2021:0776-1, SUSE-SU-2021:0777-1, openSUSE-SU-2024:13514-1

## What is CVE-2021-25316?

CVE-2021-25316 is a low-severity vulnerability in SUSE Linux Enterprise Server 12-SP5, published on 14 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A Insecure Temporary File vulnerability in s390-tools of SUSE Linux Enterprise Server 12-SP5, SUSE Linux Enterprise Server 15-SP2 allows local attackers to prevent VM live migrations This issue affects: SUSE Linux Enterprise Server 12-SP5 s390-tools versions prior to 2.1.0-18.29.1. SUSE Linux Enterprise Server 15-SP2 s390-tools versions prior to 2.11.0-9.20.1.

Weakness: CWE-377 (DEPRECATED: Insecure Temporary File)

## Which versions are affected by CVE-2021-25316?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `s390-tools` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 2.11.0-9.20.1 |
| `s390-tools` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.1.0-18.29.1 |
| `s390-tools` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.1.0-18.29.1 |
| `s390-tools` | openSUSE:Tumbleweed | All versions | 2.30.0-1.1 |

Products: Suse S390-Tools.

## How do I fix CVE-2021-25316?

Apply the vendor's patch.

## Is CVE-2021-25316 being exploited?

There is no known exploitation of CVE-2021-25316 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25316 and fix it if it is affected.

What it is: CVE-2021-25316 is a low-severity vulnerability in SUSE Linux Enterprise Server 12-SP5, published on 14 Apr 2021. 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-2021-25316 in the wild and no public exploit code.

Affected product: SUSE Linux Enterprise Server 12-SP5. 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-2021-25316/ (Markdown: https://insights.sbomify.com/CVE-2021-25316/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25316
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25316
- OSV: https://osv.dev/vulnerability/CVE-2021-25316

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25316/
Summaries are generated and may contain mistakes; the official description above is the record.