{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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()\u0027ed 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()\u0027ed 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()\u0027ed task\u0027s 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\u0027 thread list."
    }
  ],
  "id": "CVE-2026-43417",
  "lastModified": "2026-05-12T14:10:27.343",
  "metrics": {},
  "published": "2026-05-08T15:16:53.700",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/28b5a1395036d6c7a6c8034d85ad3d7d365f192c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e6761cdce78a8919a537989afb6aaf6881469f83"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Undergoing Analysis"
}

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-43417"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-08T15:16:53Z",
    "severity": null
  },
  "details": "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()\u0027ed 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()\u0027ed 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()\u0027ed task\u0027s 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\u0027 thread list.",
  "id": "GHSA-hjwg-8c2j-jq5p",
  "modified": "2026-05-08T15:31:28Z",
  "published": "2026-05-08T15:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43417"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/28b5a1395036d6c7a6c8034d85ad3d7d365f192c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6761cdce78a8919a537989afb6aaf6881469f83"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}