# CVE-2018-1126: Integer overflow in procps-ng, procps

> An integer overflow in procps-ng can lead to truncation issues, potentially causing denial of service in Linux process management tools.

- **Severity:** Medium 4.8 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 23 May 2018
- **Updated:** 17 Dec 2025
- **Also known as:** DEBIAN-CVE-2018-1126, GHSA-3vhp-j7w2-qxhv, UBUNTU-CVE-2018-1126

## What is CVE-2018-1126?

CVE-2018-1126 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 23 May 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

procps-ng before version 3.3.15 is vulnerable to an incorrect integer size in proc/alloc.* leading to truncation/integer overflow issues. This flaw is related to CVE-2018-1124.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2018-1126?

It affects 10 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Procps-Ng Project Procps-Ng, Redhat Enterprise Linux, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Tus, Redhat Enterprise Linux Workstation, Schneider-Electric Struxureware Data Center Expert.

## How do I fix CVE-2018-1126?

Upgrade to a fixed version.

## Is CVE-2018-1126 being exploited?

There is no known exploitation of CVE-2018-1126 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1126 and fix it if it is affected.

What it is: CVE-2018-1126 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 23 May 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-1126 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2018-1126/ (Markdown: https://insights.sbomify.com/CVE-2018-1126/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1126
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1126
- OSV: https://osv.dev/vulnerability/CVE-2018-1126

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1126/
Summaries are generated and may contain mistakes; the official description above is the record.