CVE-2026-97523

Full vulnerability record from the local CVENow database.
Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: close race between scheduler and state change The mptcp scheduler may race with subflow sockets state change: data transmission on the selected socket may fail and a later release could try to use mss_now reset to 0 for a divide operation. Address the issue by explicitly checking for the critical scenario.
Severity
HIGH
CVSS score
7.5 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-25 11:17:02.407000
Last modified
2026-10-19 10:17:21.130000
View original CVE JSON
{
  "id": "CVE-2026-97523",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-25T11:17:02.407",
  "lastModified": "2026-10-19T10:17:21.130",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: close race between scheduler and state change\n\nThe mptcp scheduler may race with subflow sockets state change: data\ntransmission on the selected socket may fail and a later release could\ntry to use mss_now reset to 0 for a divide operation.\n\nAddress the issue by explicitly checking for the critical scenario."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/mptcp/protocol.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b",
              "lessThan": "d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c886d70286bf3ad411eb3d689328a67f7102c6ae",
              "lessThan": "5883ae880f51edc4b1484e787473b865b6159ead",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c886d70286bf3ad411eb3d689328a67f7102c6ae",
              "lessThan": "0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c886d70286bf3ad411eb3d689328a67f7102c6ae",
              "lessThan": "8f11430d51ff8365bc51b670bc3002b65ae4c6b7",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c886d70286bf3ad411eb3d689328a67f7102c6ae",
              "lessThan": "a09c87abf10a0a7e203137c75b5381aa63d9b31d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c886d70286bf3ad411eb3d689328a67f7102c6ae",
              "lessThan": "4c856f3c151a2f3fa237caa651c44015916ca584",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c886d70286bf3ad411eb3d689328a67f7102c6ae",
              "lessThan": "42064de57fb83231fcc89663a94885f228a1ee53",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "8caf5c15b5288d52d9c89374d6c10fa32ee84ec5",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5.15.190",
              "lessThan": "5.15.222",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.19.4",
              "lessThan": "5.20",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/mptcp/protocol.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.0",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.0",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.222",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.189",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.158",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.111",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.53",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.7",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/42064de57fb83231fcc89663a94885f228a1ee53",
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    },
    {
      "url": "https://git.kernel.org/stable/c/4c856f3c151a2f3fa237caa651c44015916ca584",
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    },
    {
      "url": "https://git.kernel.org/stable/c/5883ae880f51edc4b1484e787473b865b6159ead",
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    },
    {
      "url": "https://git.kernel.org/stable/c/8f11430d51ff8365bc51b670bc3002b65ae4c6b7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a09c87abf10a0a7e203137c75b5381aa63d9b31d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03",
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}