FKIE_CVE-2026-97568

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00b2bd518911e0daab00f4749cce68c191ccebb4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/06d649f9cd03a9f8e768a658b20acf8d2c8022e0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/61178d0b85b4b1b53e78b06e89d018d22d102f88
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b76c0e28b392620dfbaf92cdeedbf115820b44cb
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/syncookies.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "61178d0b85b4b1b53e78b06e89d018d22d102f88",
              "status": "affected",
              "version": "efd340bf3d7779a3a8ec954d8ec0fb8a10f24982",
              "versionType": "git"
            },
            {
              "lessThan": "00b2bd518911e0daab00f4749cce68c191ccebb4",
              "status": "affected",
              "version": "efd340bf3d7779a3a8ec954d8ec0fb8a10f24982",
              "versionType": "git"
            },
            {
              "lessThan": "06d649f9cd03a9f8e768a658b20acf8d2c8022e0",
              "status": "affected",
              "version": "efd340bf3d7779a3a8ec954d8ec0fb8a10f24982",
              "versionType": "git"
            },
            {
              "lessThan": "b76c0e28b392620dfbaf92cdeedbf115820b44cb",
              "status": "affected",
              "version": "efd340bf3d7779a3a8ec954d8ec0fb8a10f24982",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1008f2bcbc8e461c1df3aebba30ac4f616ebe570",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6f01f41b6a492ddf2da7609967cfaf57e7ca48a7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "09176f80995105c62939728fbad5c437d61e7ff4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8ed3e34c766e8264d5d2e0436f86c51604d6a8a7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "73e2baa301ee3f62ff971e68877adeb37f98cc67",
              "versionType": "git"
            },
            {
              "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-97568",
  "lastModified": "2026-09-25T11:17:07.453",
  "metrics": {},
  "published": "2026-09-25T11:17:07.453",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/00b2bd518911e0daab00f4749cce68c191ccebb4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/06d649f9cd03a9f8e768a658b20acf8d2c8022e0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/61178d0b85b4b1b53e78b06e89d018d22d102f88"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b76c0e28b392620dfbaf92cdeedbf115820b44cb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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