GHSA-8376-779W-5HCF

Vulnerability from github – Published: 2025-03-06 18:31 – Updated: 2026-05-12 15:30
VLAI
Details

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

netfilter: nf_tables: reject mismatching sum of field_len with set key length

The field length description provides the length of each separated key field in the concatenation, each field gets rounded up to 32-bits to calculate the pipapo rule width from pipapo_init(). The set key length provides the total size of the key aligned to 32-bits.

Register-based arithmetics still allows for combining mismatching set key length and field length description, eg. set key length 10 and field description [ 5, 4 ] leading to pipapo width of 12.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-21826"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-06T16:15:54Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: reject mismatching sum of field_len with set key length\n\nThe field length description provides the length of each separated key\nfield in the concatenation, each field gets rounded up to 32-bits to\ncalculate the pipapo rule width from pipapo_init(). The set key length\nprovides the total size of the key aligned to 32-bits.\n\nRegister-based arithmetics still allows for combining mismatching set\nkey length and field length description, eg. set key length 10 and field\ndescription [ 5, 4 ] leading to pipapo width of 12.",
  "id": "GHSA-8376-779w-5hcf",
  "modified": "2026-05-12T15:30:50Z",
  "published": "2025-03-06T18:31:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21826"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-503939.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b9335a8000fb70742f7db10af314104b6ace220"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ac254343d3cf228ae0738b2615fedf85d000752"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49b7182b97bafbd5645414aff054b4a65d05823d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5083a7ae45003456c253e981b30a43f71230b4a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b467c8feac759f4c5c86d708beca2aa2b29584f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82e491e085719068179ff6a5466b7387cc4bbf32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab50d0eff4a939d20c37721fd9766347efcdb6f6"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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