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CVE-2026-43494

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: net/rds: reset op_nents when zerocopy page pin fails When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(), the pinned pages are released with put_page(), and rm->data.op_mmp_znotifier is cleared. But we fail to properly clear rm->data.op_nents. Later when rds_message_purge() is called from rds_sendmsg() the cleanup loop iterates over the incorrectly non zero number of op_nents and frees them again. Fix this by properly resetting op_nents when it should be in rds_message_zcopy_from_user().

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-21 12:16:19.957000
Last modified
2026-10-19 20:18:18.620000
View original CVE JSON 
{
  "id": "CVE-2026-43494",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-05-21T12:16:19.957",
  "lastModified": "2026-10-19T20:18:18.620",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rds: reset op_nents when zerocopy page pin fails\n\nWhen iov_iter_get_pages2() fails in rds_message_zcopy_from_user(),\nthe pinned pages are released with put_page(), and\nrm->data.op_mmp_znotifier is cleared.  But we fail to properly\nclear rm->data.op_nents.\n\nLater when rds_message_purge() is called from rds_sendmsg() the\ncleanup loop iterates over the incorrectly non zero number of\nop_nents and frees them again.\n\nFix this by properly resetting op_nents when it should be in\nrds_message_zcopy_from_user()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/rds: restablecer op_nents cuando falla el anclaje de página de copia cero\n\nCuando iov_iter_get_pages2() falla en rds_message_zcopy_from_user(), las páginas ancladas se liberan con put_page(), y rm->data.op_mmp_znotifier se borra. Pero no logramos borrar correctamente rm->data.op_nents.\n\nMás tarde, cuando se llama a rds_message_purge() desde rds_sendmsg(), el bucle de limpieza itera sobre el número incorrectamente no cero de op_nents y los libera de nuevo.\n\nSolucionar esto restableciendo correctamente op_nents cuando debería ser en rds_message_zcopy_from_user()."
    }
  ],
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