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mptcp: syncookies: remember the request backup flag

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-97568

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-97568

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1008f2bcbc8e461c1df3aebba30ac4f616ebe570",
        "lessThan": "c97fa2c7ada82d4cac1c6c00643238dc4c462f15",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6f01f41b6a492ddf2da7609967cfaf57e7ca48a7",
        "lessThan": "1668b34452009d27be3262646de748a3e48ffd51",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "09176f80995105c62939728fbad5c437d61e7ff4",
        "lessThan": "b138e7dc719f0a3949de8bb6500b8cf1604eea06",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8ed3e34c766e8264d5d2e0436f86c51604d6a8a7",
        "lessThan": "360d99258a6402cb8e49771460944f19f04d25b7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efd340bf3d7779a3a8ec954d8ec0fb8a10f24982",
        "lessThan": "61178d0b85b4b1b53e78b06e89d018d22d102f88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efd340bf3d7779a3a8ec954d8ec0fb8a10f24982",
        "lessThan": "00b2bd518911e0daab00f4749cce68c191ccebb4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efd340bf3d7779a3a8ec954d8ec0fb8a10f24982",
        "lessThan": "06d649f9cd03a9f8e768a658b20acf8d2c8022e0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "efd340bf3d7779a3a8ec954d8ec0fb8a10f24982",
        "lessThan": "b76c0e28b392620dfbaf92cdeedbf115820b44cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73e2baa301ee3f62ff971e68877adeb37f98cc67",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.224",
        "lessThan": "5.10.271",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.15.165",
        "lessThan": "5.15.222",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.104",
        "lessThan": "6.1.189",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.6.45",
        "lessThan": "6.6.158",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.10.4",
        "lessThan": "6.11",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/mptcp/syncookies.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/mptcp/syncookies.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97568

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38012 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-97568 · Revision 1Source updated