CVE-2026-97568 (GCVE-0-2026-97568)
Vulnerability from cvelistv5
Published
2026-09-25 10:21
Modified
2026-10-19 09:09
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1008f2bcbc8e461c1df3aebba30ac4f616ebe570
Version: 6f01f41b6a492ddf2da7609967cfaf57e7ca48a7
Version: 09176f80995105c62939728fbad5c437d61e7ff4
Version: 8ed3e34c766e8264d5d2e0436f86c51604d6a8a7
Version: efd340bf3d7779a3a8ec954d8ec0fb8a10f24982
Version: efd340bf3d7779a3a8ec954d8ec0fb8a10f24982
Version: efd340bf3d7779a3a8ec954d8ec0fb8a10f24982
Version: efd340bf3d7779a3a8ec954d8ec0fb8a10f24982
Version: 73e2baa301ee3f62ff971e68877adeb37f98cc67
Version: 5.10.224   ≤
Version: 5.15.165   ≤
Version: 6.1.104   ≤
Version: 6.6.45   ≤
Version: 6.10.4   ≤
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
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          "vendor": "Linux",
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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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": "2026-10-19T09:09:31.044Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c97fa2c7ada82d4cac1c6c00643238dc4c462f15"
        },
        {
          "url": "https://git.kernel.org/stable/c/1668b34452009d27be3262646de748a3e48ffd51"
        },
        {
          "url": "https://git.kernel.org/stable/c/b138e7dc719f0a3949de8bb6500b8cf1604eea06"
        },
        {
          "url": "https://git.kernel.org/stable/c/360d99258a6402cb8e49771460944f19f04d25b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/61178d0b85b4b1b53e78b06e89d018d22d102f88"
        },
        {
          "url": "https://git.kernel.org/stable/c/00b2bd518911e0daab00f4749cce68c191ccebb4"
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          "url": "https://git.kernel.org/stable/c/06d649f9cd03a9f8e768a658b20acf8d2c8022e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/b76c0e28b392620dfbaf92cdeedbf115820b44cb"
        }
      ],
      "title": "mptcp: syncookies: remember the request backup flag",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97568",
    "datePublished": "2026-09-25T10:21:54.269Z",
    "dateReserved": "2026-09-24T16:01:01.155Z",
    "dateUpdated": "2026-10-19T09:09:31.044Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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