CVE-2025-38730

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/net: commit partial buffers on retry Ring provided buffers are potentially only valid within the single execution context in which they were acquired. io_uring deals with this and invalidates them on retry. But on the networking side, if MSG_WAITALL is set, or if the socket is of the streaming type and too little was processed, then it will hang on to the buffer rather than recycle or commit it. This is problematic for two reasons: 1) If someone unregisters the provided buffer ring before a later retry, then the req->buf_list will no longer be valid. 2) If multiple sockers are using the same buffer group, then multiple receives can consume the same memory. This can cause data corruption in the application, as either receive could land in the same userspace buffer. Fix this by disallowing partial retries from pinning a provided buffer across multiple executions, if ring provided buffers are used.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Modified

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2025-09-04 16:15:43.167000

Last modified

2026-10-19 21:10:00.160000

View original CVE JSON

{
  "id": "CVE-2025-38730",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-04T16:15:43.167",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: commit partial buffers on retry\n\nRing provided buffers are potentially only valid within the single\nexecution context in which they were acquired. io_uring deals with this\nand invalidates them on retry. But on the networking side, if\nMSG_WAITALL is set, or if the socket is of the streaming type and too\nlittle was processed, then it will hang on to the buffer rather than\nrecycle or commit it. This is problematic for two reasons:\n\n1) If someone unregisters the provided buffer ring before a later retry,\n   then the req->buf_list will no longer be valid.\n\n2) If multiple sockers are using the same buffer group, then multiple\n   receives can consume the same memory. This can cause data corruption\n   in the application, as either receive could land in the same\n   userspace buffer.\n\nFix this by disallowing partial retries from pinning a provided buffer\nacross multiple executions, if ring provided buffers are used."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring/net: confirmar búferes parciales al reintentar\n\nLos búferes proporcionados por el anillo son potencialmente válidos solo dentro del único contexto de ejecución en el que fueron adquiridos. io_uring maneja esto y los invalida al reintentar. Pero en el lado de la red, si MSG_WAITALL está configurado, o si el socket es de tipo streaming y se procesó muy poco, entonces se aferrará al búfer en lugar de reciclarlo o confirmarlo. Esto es problemático por dos razones:\n\n1) Si alguien anula el registro del anillo de búferes proporcionado antes de un reintento posterior, entonces req->buf_list ya no será válido.\n\n2) Si múltiples sockets están usando el mismo grupo de búferes, entonces múltiples recepciones pueden consumir la misma memoria. Esto puede causar corrupción de datos en la aplicación, ya que cualquiera de las recepciones podría terminar en el mismo búfer de espacio de usuario.\n\nSolucione esto impidiendo que los reintentos parciales fijen un búfer proporcionado a través de múltiples ejecuciones, si se utilizan búferes proporcionados por el anillo."
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