# CVE-2024-43839: bna: adjust 'name' buf size of bna_tcb and bna_ccb structures

> A buffer overflow in the Linux kernel bna driver allows attackers to cause memory corruption, potentially leading to code execution or system crashes.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 17 Aug 2024
- **Updated:** 11 May 2026
- **Also known as:** AZL-51983, BELL-CVE-2024-43839, DEBIAN-CVE-2024-43839, GHSA-gc28-phwf-f5ww, UBUNTU-CVE-2024-43839

## What is CVE-2024-43839?

CVE-2024-43839 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 17 Aug 2024. 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:

bna: adjust 'name' buf size of bna_tcb and bna_ccb structures

To have enough space to write all possible sprintf() args. Currently
'name' size is 16, but the first '%s' specifier may already need at
least 16 characters, since 'bnad->netdev->name' is used there.

For '%d' specifiers, assume that they require:
 * 1 char for 'tx_id + tx_info->tcb[i]->id' sum, BNAD_MAX_TXQ_PER_TX is 8
 * 2 chars for 'rx_id + rx_info->rx_ctrl[i].ccb->id', BNAD_MAX_RXP_PER_RX
   is 16

And replace sprintf with snprintf.

Detected using the static analysis tool - Svace.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2024-43839?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2024-43839?

Apply the vendor's patch.

## Is CVE-2024-43839 being exploited?

There is no known exploitation of CVE-2024-43839 in the wild and no public exploit code.

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- [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-2024-43839 and fix it if it is affected.

What it is: CVE-2024-43839 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 17 Aug 2024. 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-2024-43839 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-2024-43839/ (Markdown: https://insights.sbomify.com/CVE-2024-43839/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-43839
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-43839
- OSV: https://osv.dev/vulnerability/CVE-2024-43839

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-43839/
Summaries are generated and may contain mistakes; the official description above is the record.