# CVE-2018-18504: Use after free in n/a

> An attacker can trigger a crash and read freed memory in Firefox via texture client operations, potentially leading to code execution.

- **Severity:** Critical 9.8 (`CVSS:3.0/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:** Yes
- **Published:** 5 Feb 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-fp7v-m5c3-w328, UBUNTU-CVE-2018-18504

## What is CVE-2018-18504?

CVE-2018-18504 is a critical use after free vulnerability in Canonical Ubuntu Linux, published on 5 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A crash and out-of-bounds read can occur when the buffer of a texture client is freed while it is still in use during graphic operations. This results is a potentially exploitable crash and the possibility of reading from the memory of the freed buffers. This vulnerability affects Firefox < 65.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2018-18504?

It affects 2 products.


Products: Canonical Ubuntu Linux, Mozilla Firefox.

## How do I fix CVE-2018-18504?

Upgrade to a fixed version.

## Is CVE-2018-18504 being exploited?

There is no known exploitation of CVE-2018-18504 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-2018-18504 and fix it if it is affected.

What it is: CVE-2018-18504 is a critical use after free vulnerability in Canonical Ubuntu Linux, published on 5 Feb 2019. 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-2018-18504 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-2018-18504/ (Markdown: https://insights.sbomify.com/CVE-2018-18504/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18504
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18504
- OSV: https://osv.dev/vulnerability/CVE-2018-18504

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18504/
Summaries are generated and may contain mistakes; the official description above is the record.