---
id: CVE-2025-38162
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nft_set_pipapo: prevent overflow in lookup table allocation

  When calculating the lookup table size, ensure the following
  multiplication does not overflow:

  …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nft_set_pipapo: prevent overflow in lookup table allocation

  When calculating the lookup table size, ensure the following
  multiplication does not overflow:

  …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.6, < 6.12.34'
  - 'linux_kernel >= 6.13, < 6.15.3'
patched:
  - linux_kernel 6.15.3
published: '2025-07-03'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:18:31.347'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-38162'
references:
  - url: 'https://git.kernel.org/stable/c/43fe1181f738295624696ae9ff611790edb65b5e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4c5c6aa9967dbe55bd017bb509885928d0f31206'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/91edc076439c9e2f34b176149f1c84a47a8ec32f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a9e757473561da93c6a4136f0e59aba91ec777fc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c1360ac8156c0a3f2385baef91d8d26fd9d39701'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-082556.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-457936.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38162.json
  - url: 'https://access.redhat.com/security/cve/CVE-2025-38162'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2376038'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2025-38162'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-38162'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2025070340-CVE-2025-38162-cd74@gregkh/T
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00184
epssPercentile: 0.07909
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:47:58.834521Z'
scores:
  nvd: 7.8
  vendor: 5.5
ingestedAt: '2026-09-08T15:33:26.997Z'
---

## Overview

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

netfilter: nft_set_pipapo: prevent overflow in lookup table allocation

When calculating the lookup table size, ensure the following
multiplication does not overflow:

- desc->field_len[] maximum value is U8_MAX multiplied by
  NFT_PIPAPO_GROUPS_PER_BYTE(f) that can be 2, worst case.
- NFT_PIPAPO_BUCKETS(f->bb) is 2^8, worst case.
- sizeof(unsigned long), from sizeof(*f->lt), lt in
  struct nft_pipapo_field.

Then, use check_mul_overflow() to multiply by bucket size and then use
check_add_overflow() to the alignment for avx2 (if needed). Finally, add
lt_size_check_overflow() helper and use it to consolidate this.

While at it, replace leftover allocation using the GFP_KERNEL to
GFP_KERNEL_ACCOUNT for consistency, in pipapo_resize().

## Affected

- `linux_kernel >= 5.6, < 6.12.34`
- `linux_kernel >= 6.13, < 6.15.3`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.15.3`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38162.json)