# CVE-2023-54129: octeontx2-af: Add validation for lmac type

> A missing validation in the octeontx2-af driver causes a kernel panic when firmware reports an invalid lmac_type_id, leading to denial of service.

- **Severity:** High 7.1 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H`)
- **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:** 24 Dec 2025
- **Updated:** 5 Aug 2026
- **Also known as:** BELL-CVE-2023-54129, DEBIAN-CVE-2023-54129, GHSA-646g-pwv5-gp8f, ROOT-OS-DEBIAN-11-CVE-2023-54129, ROOT-OS-UBUNTU-2204-CVE-2023-54129, UBUNTU-CVE-2023-54129

## What is CVE-2023-54129?

CVE-2023-54129 is a high-severity vulnerability in Linux, published on 24 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

octeontx2-af: Add validation for lmac type

Upon physical link change, firmware reports to the kernel about the
change along with the details like speed, lmac_type_id, etc.
Kernel derives lmac_type based on lmac_type_id received from firmware.

In a few scenarios, firmware returns an invalid lmac_type_id, which
is resulting in below kernel panic. This patch adds the missing
validation of the lmac_type_id field.

Internal error: Oops: 96000005 [#1] PREEMPT SMP
[   35.321595] Modules linked in:
[   35.328982] CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted
5.4.210-g2e3169d8e1bc-dirty #17
[   35.337014] Hardware name: Marvell CN103XX board (DT)
[   35.344297] Workqueue: events work_for_cpu_fn
[   35.352730] pstate: 40400089 (nZcv daIf +PAN -UAO)
[   35.360267] pc : strncpy+0x10/0x30
[   35.366595] lr : cgx_link_change_handler+0x90/0x180

## Which versions are affected by CVE-2023-54129?


## How do I fix CVE-2023-54129?

Apply the vendor's patch.

## Is CVE-2023-54129 being exploited?

There is no known exploitation of CVE-2023-54129 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-54129 and fix it if it is affected.

What it is: CVE-2023-54129 is a high-severity vulnerability in Linux, published on 24 Dec 2025. 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-2023-54129 in the wild and no public exploit code.

Affected product: 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-2023-54129/ (Markdown: https://insights.sbomify.com/CVE-2023-54129/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-54129
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-54129
- OSV: https://osv.dev/vulnerability/CVE-2023-54129

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-54129/
Summaries are generated and may contain mistakes; the official description above is the record.