Skip to content
Heist/ feed
Critical

mptcp: options: reset DSS fields in case of unexpected size

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some fields written, which could lead to inconsistency or access uninitialized data. Explicitly reset the fields that could have been modified in case of unexpected size.

Announced Source revision 1
Original source ↗

CVE-2026-80586

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-2026-80586

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": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
        "lessThan": "15e35fdad7a5576bf3f1c8d688877aeb5d1b506b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
        "lessThan": "b1256090816ec46011601e084be580731df58fc7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
        "lessThan": "192878df582c51d440bf7b91a15f297f29f2b596",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
        "lessThan": "26dac5c9ffb20812b475fdf253eb04fab99cff3b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
        "lessThan": "4e80eff5c1c893aca2ac1d202f0b256d2e52ecde",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
        "lessThan": "1fade1b2ac5b1a4948e538fae7313bea57b5ac36",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
        "lessThan": "27ed642a4e7e4b5df4b8522c72c457a67e052493",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "648ef4b88673dadb8463bf0d4b10fbf33d55def8",
        "lessThan": "35772b4981f38ba8059372cde8753e8e477e98ec",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/mptcp/options.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.266",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.217",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.153",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.105",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/mptcp/options.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80586

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#34334 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement