{
  "cveId": "CVE-2026-43417",
  "url": "https://patchblox.com/security/cve/CVE-2026-43417",
  "summary": "CVE-2026-43417 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43417 (version 6.19.10-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sched/mmcid: Handle vfork()/CLONE_VM correctly...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sched/mmcid: Handle vfork()/CLONE_VM correctly  Matthieu and Jiri reported stalls where a task endlessly loops in mm_get_cid() when scheduling in.  It turned out that the logic which handles vfork()\u0027ed tasks is broken. It is invoked when the number of tasks associated to a process is smaller than the number of MMCID users. It then walks the task list to find the vfork()\u0027ed task, but accounts all the already processed tasks as well.  If that double processing brings the number of to be handled tasks to 0, the walk stops and the vfork()\u0027ed task\u0027s CID is not fixed up. As a consequence a subsequent schedule in fails to acquire a (transitional) CID and the machine stalls.  Cure this by removing the accounting condition and make the fixup always walk the full task list if it could not find the exact number of users in the process\u0027 thread list.",
  "published": "2026-05-08T15:16:53Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00107,
  "epssPercentile": 0.01167,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.10-1",
      "fix": "DEBIAN-CVE-2026-43417",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43417",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}