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GHSA-6CG2-HRXF-655W

Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

mptcp: syncookies: remember the request backup flag

Instead of using an uninitialised bit when copying the info in subflow_ulp_clone().

To fix this, no need to extend the join_entry structure: backup is coming from struct mptcp_subflow_request_sock, only one bit. Do the same here by using one bit for both.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-97568"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-25T11:17:07Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: syncookies: remember the request backup flag\n\nInstead of using an uninitialised bit when copying the info in\nsubflow_ulp_clone().\n\nTo fix this, no need to extend the join_entry structure: backup is\ncoming from struct mptcp_subflow_request_sock, only one bit. Do the same\nhere by using one bit for both.",
  "id": "GHSA-6cg2-hrxf-655w",
  "modified": "2026-09-25T12:31:25Z",
  "published": "2026-09-25T12:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97568"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/00b2bd518911e0daab00f4749cce68c191ccebb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06d649f9cd03a9f8e768a658b20acf8d2c8022e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61178d0b85b4b1b53e78b06e89d018d22d102f88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b76c0e28b392620dfbaf92cdeedbf115820b44cb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-97568 (GCVE-0-2026-97568)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:21 – Updated: 2026-09-25 10:21

Title

mptcp: syncookies: remember the request backup flag

Summary

In the Linux kernel, the following vulnerability has been resolved: mptcp: syncookies: remember the request backup flag Instead of using an uninitialised bit when copying the info in subflow_ulp_clone(). To fix this, no need to extend the join_entry structure: backup is coming from struct mptcp_subflow_request_sock, only one bit. Do the same here by using one bit for both.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/61178d0b85b4b1b53…
https://git.kernel.org/stable/c/00b2bd518911e0daa…
https://git.kernel.org/stable/c/06d649f9cd03a9f8e…
https://git.kernel.org/stable/c/b76c0e28b392620df…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 , < 61178d0b85b4b1b53e78b06e89d018d22d102f88 (git) Affected: efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 , < 00b2bd518911e0daab00f4749cce68c191ccebb4 (git) Affected: efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 , < 06d649f9cd03a9f8e768a658b20acf8d2c8022e0 (git) Affected: efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 , < b76c0e28b392620dfbaf92cdeedbf115820b44cb (git) Affected: 1008f2bcbc8e461c1df3aebba30ac4f616ebe570 (git) Affected: 6f01f41b6a492ddf2da7609967cfaf57e7ca48a7 (git) Affected: 09176f80995105c62939728fbad5c437d61e7ff4 (git) Affected: 8ed3e34c766e8264d5d2e0436f86c51604d6a8a7 (git) Affected: 73e2baa301ee3f62ff971e68877adeb37f98cc67 (git) Affected: 5.10.224 , < 5.11 (semver) Affected: 5.15.165 , < 5.16 (semver) Affected: 6.1.104 , < 6.2 (semver) Affected: 6.6.45 , < 6.7 (semver) Affected: 6.10.4 , < 6.11 (semver)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/syncookies.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "lessThan": "61178d0b85b4b1b53e78b06e89d018d22d102f88",
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              "versionType": "git"
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              "status": "affected",
              "version": "73e2baa301ee3f62ff971e68877adeb37f98cc67",
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            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.224",
              "versionType": "semver"
            },
            {
              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.165",
              "versionType": "semver"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.104",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.45",
              "versionType": "semver"
            },
            {
              "lessThan": "6.11",
              "status": "affected",
              "version": "6.10.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/syncookies.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                  "versionStartIncluding": "6.10.4",
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                }
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              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: syncookies: remember the request backup flag\n\nInstead of using an uninitialised bit when copying the info in\nsubflow_ulp_clone().\n\nTo fix this, no need to extend the join_entry structure: backup is\ncoming from struct mptcp_subflow_request_sock, only one bit. Do the same\nhere by using one bit for both."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T10:21:54.269Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2026-09-25T10:21:54.269Z",
    "dateReserved": "2026-09-24T16:01:01.155Z",
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    "state": "PUBLISHED"
  },
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-6CG2-HRXF-655W

CVE-2026-97568 (GCVE-0-2026-97568)

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