# CVE-2017-7558: Information disclosure in kernel

> A local attacker can leak up to 100 bytes of kernel slab memory via SCTP diagnostic functions, potentially exposing sensitive data.

- **Severity:** Medium 5.1 (`CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Jul 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2017-7558, GHSA-5vf3-w6cv-wf86, UBUNTU-CVE-2017-7558

## What is CVE-2017-7558?

CVE-2017-7558 is a medium-severity vulnerability in Debian Debian Linux, published on 26 Jul 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A kernel data leak due to an out-of-bound read was found in the Linux kernel in inet_diag_msg_sctp{,l}addr_fill() and sctp_get_sctp_info() functions present since version 4.7-rc1 through version 4.13. A data leak happens when these functions fill in sockaddr data structures used to export socket's diagnostic information. As a result, up to 100 bytes of the slab data could be leaked to a userspace.

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

## Which versions are affected by CVE-2017-7558?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2017-7558?

Apply the vendor's patch.

## Is CVE-2017-7558 being exploited?

There is no known exploitation of CVE-2017-7558 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-7558 and fix it if it is affected.

What it is: CVE-2017-7558 is a medium-severity vulnerability in Debian Debian Linux, published on 26 Jul 2018. 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-2017-7558 in the wild and no public exploit code.

Affected product: Debian Debian 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-2017-7558/ (Markdown: https://insights.sbomify.com/CVE-2017-7558/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-7558
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-7558
- OSV: https://osv.dev/vulnerability/CVE-2017-7558

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-7558/
Summaries are generated and may contain mistakes; the official description above is the record.