Vulnerability-Lookup

GHSA-M5W6-2MRP-4227

Vulnerability from github – Published: 2026-05-21 12:31 – Updated: 2026-05-21 18:33

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().

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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": null
  },
  "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": "2026-05-21T18:33:09Z",
  "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/e174929793195e0cd6a4adb0cad731b39f9019b4"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/21/2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-43494 (GCVE-0-2026-43494)

Vulnerability from cvelistv5 – Published: 2026-05-21 10:49 – Updated: 2026-05-23 11:25

Title

net/rds: reset op_nents when zerocopy page pin fails

Summary

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 ?

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/9115669faedccdda1…
https://git.kernel.org/stable/c/0bbbff00a15b1df2c…
https://git.kernel.org/stable/c/640e37f58f991546a…
https://git.kernel.org/stable/c/290e833d1acb1093b…
https://git.kernel.org/stable/c/e174929793195e0cd…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 9115669faedccdda100428e2d26fd0aac8c50799 (git) Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 0bbbff00a15b1df2cac9014d6cf4b6890f473353 (git) Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 640e37f58f991546a87540d067279c2c1fa9fe51 (git) Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < 290e833d1acb1093bc121fcdc97f5e6161157479 (git) Affected: 0cebaccef3acbdfbc2d85880a2efb765d2f4e2e3 , < e174929793195e0cd6a4adb0cad731b39f9019b4 (git)
Linux	Linux	Affected: 4.17 Unaffected: 0 , < 4.17 (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1-rc4 , ≤ * (original_commit_for_fix)

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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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-M5W6-2MRP-4227

CVE-2026-43494 (GCVE-0-2026-43494)

Tags

Sightings

Nomenclature