GHSA-J842-PQ84-9GPJ

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32
VLAI
Details

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

phonet: pep: do not write beyond optlen in getsockopt

pep_getsockopt() clamps the reported length to the caller's buffer with min_t(), but then stores the value with put_user(val, (int __user *) optval), which always writes sizeof(int) bytes. A getsockopt() call with an optlen smaller than sizeof(int) thus reports the clamped length yet writes a full int, one to three bytes past the user buffer.

Write the value with copy_to_user() bounded by len, so at most optlen bytes are copied, matching the length reported back to userspace.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90327"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nphonet: pep: do not write beyond optlen in getsockopt\n\npep_getsockopt() clamps the reported length to the caller\u0027s buffer with\nmin_t(), but then stores the value with put_user(val, (int __user *)\noptval), which always writes sizeof(int) bytes. A getsockopt() call with\nan optlen smaller than sizeof(int) thus reports the clamped length yet\nwrites a full int, one to three bytes past the user buffer.\n\nWrite the value with copy_to_user() bounded by len, so at most optlen\nbytes are copied, matching the length reported back to userspace.",
  "id": "GHSA-j842-pq84-9gpj",
  "modified": "2026-09-17T18:32:01Z",
  "published": "2026-09-17T18:32:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90327"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/056eea1a2068ad2fb7c3093c5f1095268f87d0c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1bf499e438da80455e258049bce60ffb3a53f3fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6054fed6bad08b6d03973e8ffca7f0c9394d1c30"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77e5eb0e192aec6710c03ca8144582fd2af36ca4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95e0ed2439dd1792eb454c68ae8d10f30ffe3bff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4487e4d5309de587479ecc2f5173b49586f46f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eac733a0b6fe0a52d91f9f623425735ed50ac6c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f97022fefe6eb06ee18549d603420440f2959802"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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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.

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