{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-43417",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-43417",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-05-08T14:21:53.618Z",
    "updatedAt": "2026-05-11T22:24:11.172Z",
    "importedAt": "2026-10-24T01:58:14.884Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "sched/mmcid: Handle vfork()/CLONE_VM correctly",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/mmcid: Handle vfork()/CLONE_VM correctly\n\nMatthieu and Jiri reported stalls where a task endlessly loops in\nmm_get_cid() when scheduling in.\n\nIt turned out that the logic which handles vfork()'ed tasks is broken. It\nis invoked when the number of tasks associated to a process is smaller than\nthe number of MMCID users. It then walks the task list to find the\nvfork()'ed task, but accounts all the already processed tasks as well.\n\nIf that double processing brings the number of to be handled tasks to 0,\nthe walk stops and the vfork()'ed task's CID is not fixed up. As a\nconsequence a subsequent schedule in fails to acquire a (transitional) CID\nand the machine stalls.\n\nCure this by removing the accounting condition and make the fixup always\nwalk the full task list if it could not find the exact number of users in\nthe process' thread list.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "fbd0e71dc370af73f6b316e4de9eed273dd90340",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e6761cdce78a8919a537989afb6aaf6881469f83"
            },
            {
              "version": "fbd0e71dc370af73f6b316e4de9eed273dd90340",
              "status": "affected",
              "versionType": "git",
              "lessThan": "28b5a1395036d6c7a6c8034d85ad3d7d365f192c"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.19",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.19"
            },
            {
              "version": "6.19.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}