# CVE-2019-3701: Memory corruption in n/a

> A privileged user can trigger memory corruption in the Linux kernel CAN gateway, potentially causing a system crash or arbitrary code execution.

- **Severity:** Medium 4.4 (`CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Jan 2019
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-3701, GHSA-28gp-589x-6r7f, UBUNTU-CVE-2019-3701

## What is CVE-2019-3701?

CVE-2019-3701 is a medium-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 3 Jan 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An issue was discovered in can_can_gw_rcv in net/can/gw.c in the Linux kernel through 4.19.13. The CAN frame modification rules allow bitwise logical operations that can be also applied to the can_dlc field. The privileged user "root" with CAP_NET_ADMIN can create a CAN frame modification rule that makes the data length code a higher value than the available CAN frame data size. In combination with a configured checksum calculation where the result is stored relatively to the end of the data (e.g. cgw_csum_xor_rel) the tail of the skb (e.g. frag_list pointer in skb_shared_info) can be rewritten which finally can cause a system crash. Because of a missing check, the CAN drivers may write arbitrary content beyond the data registers in the CAN controller's I/O memory when processing can-gw manipulated outgoing frames.

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

## Which versions are affected by CVE-2019-3701?

It affects 3 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel.

## How do I fix CVE-2019-3701?

Apply the vendor's patch.

## Is CVE-2019-3701 being exploited?

There is no known exploitation of CVE-2019-3701 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-2019-3701 and fix it if it is affected.

What it is: CVE-2019-3701 is a medium-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 3 Jan 2019. 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-2019-3701 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-2019-3701/ (Markdown: https://insights.sbomify.com/CVE-2019-3701/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3701
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3701
- OSV: https://osv.dev/vulnerability/CVE-2019-3701

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3701/
Summaries are generated and may contain mistakes; the official description above is the record.