CVE-2025-38566 (GCVE-0-2025-38566)
Vulnerability from cvelistv5
Published
2025-08-19 17:02
Modified
2025-09-29 05:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix handling of server side tls alerts Scott Mayhew discovered a security exploit in NFS over TLS in tls_alert_recv() due to its assumption it can read data from the msg iterator's kvec.. kTLS implementation splits TLS non-data record payload between the control message buffer (which includes the type such as TLS aler or TLS cipher change) and the rest of the payload (say TLS alert's level/description) which goes into the msg payload buffer. This patch proposes to 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 msg buffer and read in the control message such as a TLS alert. 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
Impacted products
Vendor Product Version
Linux Linux Version: 5e052dda121e2870dd87181783da4a95d7d2927b
Version: 5e052dda121e2870dd87181783da4a95d7d2927b
Version: 5e052dda121e2870dd87181783da4a95d7d2927b
Version: 5e052dda121e2870dd87181783da4a95d7d2927b
Version: 5e052dda121e2870dd87181783da4a95d7d2927b
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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 handling of server side tls alerts\n\nScott Mayhew discovered a security exploit in NFS over TLS in\ntls_alert_recv() due to its assumption it can read data from\nthe msg iterator\u0027s kvec..\n\nkTLS implementation splits TLS non-data record payload between\nthe control message buffer (which includes the type such as TLS\naler or TLS cipher change) and the rest of the payload (say TLS\nalert\u0027s level/description) which goes into the msg payload buffer.\n\nThis patch proposes to rework how control messages are setup and\nused 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\nkvec backed msg buffer and read in the control message such as a\nTLS alert. Msg iterator can advance the kvec pointer as a part of\nthe copy process thus we need to revert the iterator before calling\ninto the tls_alert_recv."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:53:54.931Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bee47cb026e762841f3faece47b51f985e215edb"
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      ],
      "title": "sunrpc: fix handling of server side tls alerts",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38566",
    "datePublished": "2025-08-19T17:02:42.506Z",
    "dateReserved": "2025-04-16T04:51:24.025Z",
    "dateUpdated": "2025-09-29T05:53:54.931Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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