---
id: CVE-2025-38120
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nf_set_pipapo_avx2: fix initial map fill

  If the first field doesn't cover the entire start map, then we must zero
  out the remainder, else we leak those bits…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nf_set_pipapo_avx2: fix initial map fill

  If the first field doesn't cover the entire start map, then we must zero
  out the remainder, else we leak those bits…
severity: critical
cvss: 9.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.15.165, < 5.15.186'
  - 'linux_kernel >= 6.1.103, < 6.1.142'
  - 'linux_kernel >= 6.6.44, < 6.6.94'
  - 'linux_kernel >= 6.10.3, < 6.12.34'
  - 'linux_kernel >= 6.13, < 6.15.3'
  - debian_linux = 11.0
patched:
  - linux_kernel 6.15.3
published: '2025-07-03'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:18:28.600'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-38120'
references:
  - url: 'https://git.kernel.org/stable/c/251496ce1728c9fd47bd2b20a7b21b20b9a020ca'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/39bab2d3517b5b50c609b4f8c66129bf619fffa0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8068e1e42b46518ce680dc6470bcd710efc3fa0a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8164d0efaf370c425dc69a1e8216940d09e7de0c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/90bc7f5a244aadee4292b28098b7c98aadd4b3aa'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b5ad58285f9217d68cd5ea2ad86ce254a3fe7c4d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ea77c397bff8b6d59f6d83dae1425b08f465e8b5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
epss: 0.00511
epssPercentile: 0.43411
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-15T21:47:44.948975Z'
ingestedAt: '2026-10-15T22:48:25.494Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_set_pipapo_avx2: fix initial map fill

If the first field doesn't cover the entire start map, then we must zero
out the remainder, else we leak those bits into the next match round map.

The early fix was incomplete and did only fix up the generic C
implementation.

A followup patch adds a test case to nft_concat_range.sh.

## Affected

- `linux_kernel >= 5.15.165, < 5.15.186`
- `linux_kernel >= 6.1.103, < 6.1.142`
- `linux_kernel >= 6.6.44, < 6.6.94`
- `linux_kernel >= 6.10.3, < 6.12.34`
- `linux_kernel >= 6.13, < 6.15.3`
- `debian_linux = 11.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.15.3`