GHSA-M5W6-2MRP-4227

Vulnerability from github – Published: 2026-05-21 12:31 – Updated: 2026-06-30 03:36
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
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-43494"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1341"
    ],
    "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": "2026-06-30T03:36:46Z",
  "published": "2026-05-21T12:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43494"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43494"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480434"
    },
    {
      "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": "https://github.com/v12-security/pocs/tree/main/pintheft"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43494.json"
    },
    {
      "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"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.