# CVE-2023-3106: Kernel: netlink socket crash (null pointer deref) in netlink_dump function

> A NULL pointer dereference in the Linux kernel netlink_dump function allows local attackers to cause a denial of service via crafted Netlink messages.

- **Severity:** Medium 6.6 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/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:** 12 Jul 2023
- **Updated:** 20 Nov 2025
- **Also known as:** DEBIAN-CVE-2023-3106, GHSA-f28c-5rx3-m73f, UBUNTU-CVE-2023-3106

## What is CVE-2023-3106?

CVE-2023-3106 is a medium-severity vulnerability in Fedoraproject Fedora, published on 12 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A NULL pointer dereference vulnerability was found in netlink_dump. This issue can occur when the Netlink socket receives the message(sendmsg) for the XFRM_MSG_GETSA, XFRM_MSG_GETPOLICY type message, and the DUMP flag is set and can cause a denial of service or possibly another unspecified impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although it is unlikely.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2023-3106?

It affects 2 products.


Products: Fedoraproject Fedora, Linux kernel.

## How do I fix CVE-2023-3106?

Apply the vendor's patch.

## Is CVE-2023-3106 being exploited?

There is no known exploitation of CVE-2023-3106 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3106 and fix it if it is affected.

What it is: CVE-2023-3106 is a medium-severity vulnerability in Fedoraproject Fedora, published on 12 Jul 2023. 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-2023-3106 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2023-3106/ (Markdown: https://insights.sbomify.com/CVE-2023-3106/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3106
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3106
- OSV: https://osv.dev/vulnerability/CVE-2023-3106

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3106/
Summaries are generated and may contain mistakes; the official description above is the record.