ghsa-r97f-5wrg-fmv7
Vulnerability from github
Published
2025-07-03 09:30
Modified
2025-07-03 09:30
Details

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().

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38162"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-03T09:15:31Z",
    "severity": null
  },
  "details": "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().",
  "id": "GHSA-r97f-5wrg-fmv7",
  "modified": "2025-07-03T09:30:35Z",
  "published": "2025-07-03T09:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38162"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43fe1181f738295624696ae9ff611790edb65b5e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c5c6aa9967dbe55bd017bb509885928d0f31206"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1360ac8156c0a3f2385baef91d8d26fd9d39701"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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