{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "648ef4b88673dadb8463bf0d4b10fbf33d55def8"
            },
            {
              "fixed": "15e35fdad7a5576bf3f1c8d688877aeb5d1b506b"
            },
            {
              "fixed": "b1256090816ec46011601e084be580731df58fc7"
            },
            {
              "fixed": "192878df582c51d440bf7b91a15f297f29f2b596"
            },
            {
              "fixed": "26dac5c9ffb20812b475fdf253eb04fab99cff3b"
            },
            {
              "fixed": "4e80eff5c1c893aca2ac1d202f0b256d2e52ecde"
            },
            {
              "fixed": "1fade1b2ac5b1a4948e538fae7313bea57b5ac36"
            },
            {
              "fixed": "27ed642a4e7e4b5df4b8522c72c457a67e052493"
            },
            {
              "fixed": "35772b4981f38ba8059372cde8753e8e477e98ec"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.10.266"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.217"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.184"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.153"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.105"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.46"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80586.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: options: reset DSS fields in case of unexpected size\n\nA remote peer could send a malformed DSS with a wrong size, followed by\nanother DSS or MPC + Data. In this case, the first suboption will be\nignored, but leaving some fields written, which could lead to\ninconsistency or access uninitialized data.\n\nExplicitly reset the fields that could have been modified in case of\nunexpected size.",
  "id": "CVE-2026-80586",
  "modified": "2026-08-28T03:30:22.787596912Z",
  "published": "2026-08-26T14:37:41.493Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15e35fdad7a5576bf3f1c8d688877aeb5d1b506b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/192878df582c51d440bf7b91a15f297f29f2b596"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fade1b2ac5b1a4948e538fae7313bea57b5ac36"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26dac5c9ffb20812b475fdf253eb04fab99cff3b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27ed642a4e7e4b5df4b8522c72c457a67e052493"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35772b4981f38ba8059372cde8753e8e477e98ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e80eff5c1c893aca2ac1d202f0b256d2e52ecde"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1256090816ec46011601e084be580731df58fc7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80586.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80586"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mptcp: options: reset DSS fields in case of unexpected size"
}