ghsa-9hq9-gv35-c42w
Vulnerability from github
Published
2025-05-09 09:33
Modified
2025-05-09 09:33
Details

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

9p/net: fix improper handling of bogus negative read/write replies

In p9_client_write() and p9_client_read_once(), if the server incorrectly replies with success but a negative write/read count then we would consider written (negative) <= rsize (positive) because both variables were signed.

Make variables unsigned to avoid this problem.

The reproducer linked below now fails with the following error instead of a null pointer deref: 9pnet: bogus RWRITE count (4294967295 > 3)

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{
  "affected": [],
  "aliases": [
    "CVE-2025-37879"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-09T07:16:09Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\n9p/net: fix improper handling of bogus negative read/write replies\n\nIn p9_client_write() and p9_client_read_once(), if the server\nincorrectly replies with success but a negative write/read count then we\nwould consider written (negative) \u003c= rsize (positive) because both\nvariables were signed.\n\nMake variables unsigned to avoid this problem.\n\nThe reproducer linked below now fails with the following error instead\nof a null pointer deref:\n9pnet: bogus RWRITE count (4294967295 \u003e 3)",
  "id": "GHSA-9hq9-gv35-c42w",
  "modified": "2025-05-09T09:33:20Z",
  "published": "2025-05-09T09:33:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37879"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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