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CVE-2026-80587 mptcp: avoid combining some incoming suboptions

🗓️ 26 Aug 2026 14:37:42Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 45 Views

Linux kernel MPTCP: invalid incoming suboption combinations not rejected per RFC8684.

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/mptcp/options.c",
      "net/mptcp/protocol.h"
    ],
    "versions": [
      {
        "version": "eda7acddf8080bb2d022a8d4b8b2345eb80c63ec",
        "lessThan": "0e2210af439755a2af352eea4178261dcf61742e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "eda7acddf8080bb2d022a8d4b8b2345eb80c63ec",
        "lessThan": "dc1d8d3eb345c616fbe922a010fa391c72c54d52",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "eda7acddf8080bb2d022a8d4b8b2345eb80c63ec",
        "lessThan": "099bfcbd0c16ae9b50aba2a1bea033e63f895da7",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "eda7acddf8080bb2d022a8d4b8b2345eb80c63ec",
        "lessThan": "a04dcc784959e4702048785d87e0d029bd2fbdcb",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "eda7acddf8080bb2d022a8d4b8b2345eb80c63ec",
        "lessThan": "6bab907292155513af397a12ccb488acbfc30d79",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "eda7acddf8080bb2d022a8d4b8b2345eb80c63ec",
        "lessThan": "b6ee361524641f57b2e2363f7737f20e17f67827",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/mptcp/options.c",
      "net/mptcp/protocol.h"
    ],
    "versions": [
      {
        "version": "5.6",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.6",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.218",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.153",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.105",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.46",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1.10",
        "lessThanOrEqual": "7.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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27 Aug 2026 12:40Current
CVSS 3.19.8
EPSS0.00403
45