netfilter: nft_set_pipapo: prevent overflow in lookup table allocation

{
  "id": "e2ba30a019a66a5665bd4699e08741f403742f4a9b71329a690d1a5127f9e282",
  "url": "https://osv.dev/vulnerability/CVE-2025-38162",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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().",
    "evidence": "osv:CVE-2025-38162",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.167",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.125",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-38162",
      "aliases": [
        "CVE-2025-38162"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "91edc076439c9e2f34b176149f1c84a47a8ec32f"
                },
                {
                  "fixed": "a9e757473561da93c6a4136f0e59aba91ec777fc"
                },
                {
                  "fixed": "c1360ac8156c0a3f2385baef91d8d26fd9d39701"
                },
                {
                  "fixed": "43fe1181f738295624696ae9ff611790edb65b5e"
                },
                {
                  "fixed": "4c5c6aa9967dbe55bd017bb509885928d0f31206"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38162.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.6.0"
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                {
                  "fixed": "6.1.167"
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              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
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                {
                  "fixed": "6.6.125"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.34"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
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                {
                  "fixed": "6.15.3"
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              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38162.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.939251255Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
        "https://git.kernel.org/stable/c/43fe1181f738295624696ae9ff611790edb65b5e",
        "https://git.kernel.org/stable/c/4c5c6aa9967dbe55bd017bb509885928d0f31206",
        "https://git.kernel.org/stable/c/91edc076439c9e2f34b176149f1c84a47a8ec32f",
        "https://git.kernel.org/stable/c/a9e757473561da93c6a4136f0e59aba91ec777fc",
        "https://git.kernel.org/stable/c/c1360ac8156c0a3f2385baef91d8d26fd9d39701",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38162.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38162",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38162.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38162",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519169,
  "published_at": "2025-07-03T08:36:03.731+00:00"
}