CVE-2025-38571 (GCVE-0-2025-38571)
Vulnerability from cvelistv5
Published
2025-08-19 17:02
Modified
2025-08-19 17:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix client side handling of tls alerts A security exploit was discovered in NFS over TLS in tls_alert_recv due to its assumption that there is valid data in the msghdr's iterator's kvec. Instead, this patch proposes the rework how control messages are setup and used by sock_recvmsg(). If no control message structure is setup, kTLS layer will read and process TLS data record types. As soon as it encounters a TLS control message, it would return an error. At that point, NFS can setup a kvec backed control buffer and read in the control message such as a TLS alert. Scott found that a msg iterator can advance the kvec pointer as a part of the copy process thus we need to revert the iterator before calling into the tls_alert_recv.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ee397eaaca4fa04db21bb98c8f1d0c6cc525368
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3feada5baf4dc96e151ff2ca54630e1d274e5458
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a55b3d15331859d9fdd261cfa6d34ca2aeb0fb95
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c36b2fbd60e8f9c6f975522130998608880c93be
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cc5d59081fa26506d02de2127ab822f40d88bc5a
Impacted products
Vendor Product Version
Linux Linux Version: dea034b963c8901bdcc3d3880c04f0d75c95112f
Version: dea034b963c8901bdcc3d3880c04f0d75c95112f
Version: dea034b963c8901bdcc3d3880c04f0d75c95112f
Version: dea034b963c8901bdcc3d3880c04f0d75c95112f
Version: dea034b963c8901bdcc3d3880c04f0d75c95112f
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   Linux Linux Version: 6.5
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/xprtsock.c"
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          "versions": [
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              "version": "0",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix client side handling of tls alerts\n\nA security exploit was discovered in NFS over TLS in tls_alert_recv\ndue to its assumption that there is valid data in the msghdr\u0027s\niterator\u0027s kvec.\n\nInstead, this patch proposes the rework how control messages are\nsetup and used by sock_recvmsg().\n\nIf no control message structure is setup, kTLS layer will read and\nprocess TLS data record types. As soon as it encounters a TLS control\nmessage, it would return an error. At that point, NFS can setup a kvec\nbacked control buffer and read in the control message such as a TLS\nalert. Scott found that a msg iterator can advance the kvec pointer\nas a part of the copy process thus we need to revert the iterator\nbefore calling into the tls_alert_recv."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-19T17:02:51.620Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/3feada5baf4dc96e151ff2ca54630e1d274e5458"
        },
        {
          "url": "https://git.kernel.org/stable/c/cc5d59081fa26506d02de2127ab822f40d88bc5a"
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      ],
      "title": "sunrpc: fix client side handling of tls alerts",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38571",
    "datePublished": "2025-08-19T17:02:51.620Z",
    "dateReserved": "2025-04-16T04:51:24.025Z",
    "dateUpdated": "2025-08-19T17:02:51.620Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38571\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:33.960\",\"lastModified\":\"2025-08-20T14:40:17.713\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsunrpc: fix client side handling of tls alerts\\n\\nA security exploit was discovered in NFS over TLS in tls_alert_recv\\ndue to its assumption that there is valid data in the msghdr\u0027s\\niterator\u0027s kvec.\\n\\nInstead, this patch proposes the rework how control messages are\\nsetup and used by sock_recvmsg().\\n\\nIf no control message structure is setup, kTLS layer will read and\\nprocess TLS data record types. As soon as it encounters a TLS control\\nmessage, it would return an error. At that point, NFS can setup a kvec\\nbacked control buffer and read in the control message such as a TLS\\nalert. Scott found that a msg iterator can advance the kvec pointer\\nas a part of the copy process thus we need to revert the iterator\\nbefore calling into the tls_alert_recv.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sunrpc: arregla el manejo del lado del cliente de las alertas tls Se descubri\u00f3 un exploit de seguridad en NFS sobre TLS en tls_alert_recv debido a su suposici\u00f3n de que hay datos v\u00e1lidos en el kvec del iterador de msghdr. En cambio, este parche propone volver a trabajar en c\u00f3mo se configuran y utilizan los mensajes de control por sock_recvmsg(). Si no se configura ninguna estructura de mensaje de control, la capa kTLS leer\u00e1 y procesar\u00e1 los tipos de registros de datos TLS. Tan pronto como encuentre un mensaje de control TLS, devolver\u00e1 un error. En ese punto, NFS puede configurar un b\u00fafer de control respaldado por kvec y leer el mensaje de control como una alerta TLS. Scott encontr\u00f3 que un iterador msg puede avanzar el puntero kvec como parte del proceso de copia, por lo tanto, necesitamos revertir el iterador antes de llamar a tls_alert_recv.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3ee397eaaca4fa04db21bb98c8f1d0c6cc525368\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3feada5baf4dc96e151ff2ca54630e1d274e5458\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a55b3d15331859d9fdd261cfa6d34ca2aeb0fb95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c36b2fbd60e8f9c6f975522130998608880c93be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cc5d59081fa26506d02de2127ab822f40d88bc5a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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