CVE-2025-38162 (GCVE-0-2025-38162)

Vulnerability from cvelistv5 – Published: 2025-07-03 08:36 – Updated: 2026-08-05 11:59
VLAI
Title
netfilter: nft_set_pipapo: prevent overflow in lookup table allocation
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: - 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().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 91edc076439c9e2f34b176149f1c84a47a8ec32f (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < a9e757473561da93c6a4136f0e59aba91ec777fc (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < c1360ac8156c0a3f2385baef91d8d26fd9d39701 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 43fe1181f738295624696ae9ff611790edb65b5e (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 4c5c6aa9967dbe55bd017bb509885928d0f31206 (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.125 , ≤ 6.6.* (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Show details on NVD website
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      "date": "2026-08-05",
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      "cve": "CVE-2025-38162",
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      "title": "netfilter: nft_set_pipapo: prevent overflow in lookup table allocation",
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      "version": "9"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38162\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-03T09:15:31.617\",\"lastModified\":\"2026-07-30T06:22:55.953\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nft_set_pipapo: prevent overflow in lookup table allocation\\n\\nWhen calculating the lookup table size, ensure the following\\nmultiplication does not overflow:\\n\\n- desc-\u003efield_len[] maximum value is U8_MAX multiplied by\\n  NFT_PIPAPO_GROUPS_PER_BYTE(f) that can be 2, worst case.\\n- NFT_PIPAPO_BUCKETS(f-\u003ebb) is 2^8, worst case.\\n- sizeof(unsigned long), from sizeof(*f-\u003elt), lt in\\n  struct nft_pipapo_field.\\n\\nThen, use check_mul_overflow() to multiply by bucket size and then use\\ncheck_add_overflow() to the alignment for avx2 (if needed). Finally, add\\nlt_size_check_overflow() helper and use it to consolidate this.\\n\\nWhile at it, replace leftover allocation using the GFP_KERNEL to\\nGFP_KERNEL_ACCOUNT for consistency, in pipapo_resize().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nft_set_pipapo: evitar el desbordamiento en la asignaci\u00f3n de la tabla de b\u00fasqueda Al calcular el tama\u00f1o de la tabla de b\u00fasqueda, aseg\u00farese de que la siguiente multiplicaci\u00f3n no se desborde: - desc-\u0026gt;field_len[] el valor m\u00e1ximo es U8_MAX multiplicado por NFT_PIPAPO_GROUPS_PER_BYTE(f) que puede ser 2, en el peor de los casos. - NFT_PIPAPO_BUCKETS(f-\u0026gt;bb) es 2^8, en el peor de los casos. - sizeof(unsigned long), de sizeof(*f-\u0026gt;lt), lt en struct nft_pipapo_field. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:12:36+00:00",
      "cve": "CVE-2025-38162",
      "id": "CVE-2025-38162",
      "initial_release_date": "2025-07-03T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service in netfilter due to integer overflow",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38162.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T00:50:22Z",
      "cve": "CVE-2025-38162",
      "id": "CVE-2025-38162",
      "initial_release_date": "2025-07-04T14:38:04Z",
      "product_status:known_affected": "604",
      "product_status:known_not_affected": "113",
      "product_status:recommended": "407",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38162",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38162.json",
      "version": "28"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.