# CVE-2023-42467: Denial of service in n/a

> An attacker can cause a denial of service in QEMU by triggering a division by zero error during SCSI disk reset operations.

- **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:** Yes
- **Published:** 11 Sep 2023
- **Updated:** 26 Sep 2024
- **Also known as:** AZL-35172, BELL-CVE-2023-42467, DEBIAN-CVE-2023-42467, GHSA-q76v-8f8c-4c2j, SUSE-SU-2025:0516-1, openSUSE-SU-2024:13364-1

## What is CVE-2023-42467?

CVE-2023-42467 is a medium-severity denial of service vulnerability in Qemu Qemu, published on 11 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

QEMU through 8.0.0 could trigger a division by zero in scsi_disk_reset in hw/scsi/scsi-disk.c because scsi_disk_emulate_mode_select does not prevent s->qdev.blocksize from being 256. This stops QEMU and the guest immediately.

Weakness: CWE-369 (Divide By Zero)

## Which versions are affected by CVE-2023-42467?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `qemu` | SUSE:Linux Enterprise Micro 5.5 | All versions | 7.1.0-150500.49.30.1 |
| `qemu` | openSUSE:Tumbleweed | All versions | 8.1.2-1.1 |

Products: Qemu Qemu.

## How do I fix CVE-2023-42467?

Apply the vendor's patch.

## Is CVE-2023-42467 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-42467 exists.

## Other vulnerabilities in Qemu Qemu

- [CVE-2022-36648](https://insights.sbomify.com/CVE-2022-36648/): Null dereference in n/a (critical 10.0)
- [CVE-2015-8556](https://insights.sbomify.com/CVE-2015-8556/): Race condition in n/a (critical 10.0)
- [CVE-2009-3616](https://insights.sbomify.com/CVE-2009-3616/): Use after free in n/a (critical 9.9)
- [CVE-2019-12928](https://insights.sbomify.com/CVE-2019-12928/): Command injection in n/a (critical 9.8)
- [CVE-2019-12929](https://insights.sbomify.com/CVE-2019-12929/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-42467 and fix it if it is affected.

What it is: CVE-2023-42467 is a medium-severity denial of service vulnerability in Qemu Qemu, published on 11 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-42467 exists.

Affected product: Qemu Qemu. 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-2023-42467/ (Markdown: https://insights.sbomify.com/CVE-2023-42467/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-42467
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-42467
- OSV: https://osv.dev/vulnerability/CVE-2023-42467

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-42467/
Summaries are generated and may contain mistakes; the official description above is the record.