{
  "cveId": "CVE-2026-74731",
  "url": "https://patchblox.com/security/cve/CVE-2026-74731",
  "summary": "CVE-2026-74731 is fixed in linux on 1 platform by DEBIAN-CVE-2026-74731 (version 7.1.9-1), released September 4, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Skip sub-disable teardown for never-l...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Skip sub-disable teardown for never-linked sub-schedulers  A sub-scheduler enable can fail before scx_link_sched() links the sched into the hierarchy, e.g. when the parent is already being disabled, and cleanup still runs the full scx_sub_disable().  That is racy against root disable: drain_descendants() is the only ordering between a sub\u0027s disable-time task walk and root disable\u0027s all-task teardown, and an unlinked sub is invisible to it. Root\u0027s teardown can thus run between the never-linked sub\u0027s drain and its walk, exiting every task to no scheduler.  The walk then trips the membership WARN and re-homes the exited tasks onto the dying hierarchy, a use-after-free.  Skip the cgroup ownership reset and the task walk if @sch was never linked, indicated by the empty -\u003Esibling as unlinking only happens later in the same function. The membership WARN remains valid: a linked sub is always waited on by an ancestor\u0027s drain.",
  "published": "2026-08-22T16:16:48Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00165,
  "epssPercentile": 0.05761,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.9-1",
      "fix": "DEBIAN-CVE-2026-74731",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-74731",
      "released": "2026-09-04T01:46:23Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}