# CVE-2019-20427: Integer overflow in n/a

> A signedness error in the Lustre file system kernel module allows remote attackers to cause a panic or potentially execute code via crafted packets.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Jan 2020
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-2m5c-rmhj-5qvf, UBUNTU-CVE-2019-20427

## What is CVE-2019-20427?

CVE-2019-20427 is a critical vulnerability in n/a, published on 27 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the Lustre file system before 2.12.3, the ptlrpc module has a buffer overflow and panic, and possibly remote code execution, due to the lack of validation for specific fields of packets sent by a client. Interaction between req_capsule_get_size and tgt_brw_write leads to a tgt_shortio2pages integer signedness error.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2019-20427?

It affects 1 product.


Products: Lustre Lustre.

## How do I fix CVE-2019-20427?

No fix has been published for CVE-2019-20427 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-20427 being exploited?

There is no known exploitation of CVE-2019-20427 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2019-20423](https://insights.sbomify.com/CVE-2019-20423/): Integer overflow in n/a (high 7.5)
- [CVE-2019-20424](https://insights.sbomify.com/CVE-2019-20424/): Null dereference in n/a (high 7.5)
- [CVE-2019-20425](https://insights.sbomify.com/CVE-2019-20425/): Memory corruption in n/a (high 7.5)
- [CVE-2019-20426](https://insights.sbomify.com/CVE-2019-20426/): Memory corruption in n/a (high 7.5)
- [CVE-2019-20428](https://insights.sbomify.com/CVE-2019-20428/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-20427 and fix it if it is affected.

What it is: CVE-2019-20427 is a critical vulnerability in n/a, published on 27 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-20427 in the wild and no public exploit code.

Affected product: n/a. 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-2019-20427/ (Markdown: https://insights.sbomify.com/CVE-2019-20427/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20427
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20427
- OSV: https://osv.dev/vulnerability/CVE-2019-20427

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-20427/
Summaries are generated and may contain mistakes; the official description above is the record.