CVE-2025-37879 (GCVE-0-2025-37879)
Vulnerability from cvelistv5
Published
2025-05-09 06:45
Modified
2025-05-26 05:22
Severity ?
Summary
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)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73b
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/9p/client.c"
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              "version": "6.6.89",
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      "descriptions": [
        {
          "lang": "en",
          "value": "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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:22:53.848Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b"
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          "url": "https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5"
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        {
          "url": "https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034"
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        {
          "url": "https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73b"
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      ],
      "title": "9p/net: fix improper handling of bogus negative read/write replies",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37879",
    "datePublished": "2025-05-09T06:45:43.197Z",
    "dateReserved": "2025-04-16T04:51:23.962Z",
    "dateUpdated": "2025-05-26T05:22:53.848Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-37879\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-09T07:16:09.143\",\"lastModified\":\"2025-05-12T17:32:32.760\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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)\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: 9p/net: se corrige el manejo incorrecto de respuestas de lectura/escritura negativas falsas. En p9_client_write() y p9_client_read_once(), si el servidor responde incorrectamente con \u00e9xito, pero con un recuento de escrituras/lecturas negativo, se considerar\u00eda que \\\"escrito\\\" (negativo) \u0026lt;= \\\"rsize\\\" (positivo) porque ambas variables estaban firmadas. Para evitar este problema, desactive el signo de las variables. El reproductor enlazado a continuaci\u00f3n ahora falla con el siguiente error en lugar de una referencia de puntero nulo: 9pnet: recuento de RWRITE falso (4294967295 \u0026gt; 3)\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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