GHSA-M5W6-2MRP-4227

Vulnerability from github – Published: 2026-05-21 12:31 – Updated: 2026-06-01 18:31
VLAI
Details

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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43494"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-21T12:16:19Z",
    "severity": "HIGH"
  },
  "details": "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-\u003edata.op_mmp_znotifier is cleared.  But we fail to properly\nclear rm-\u003edata.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().",
  "id": "GHSA-m5w6-2mrp-4227",
  "modified": "2026-06-01T18:31:31Z",
  "published": "2026-05-21T12:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43494"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03014551938a0887fa55f18ce49b70158a9c0113"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0bbbff00a15b1df2cac9014d6cf4b6890f473353"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/290e833d1acb1093bc121fcdc97f5e6161157479"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/640e37f58f991546a87540d067279c2c1fa9fe51"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9115669faedccdda100428e2d26fd0aac8c50799"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6e51512a784c4a7b86e1a044988696e3b3721fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/21/2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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