{
  "cveId": "CVE-2026-43392",
  "url": "https://patchblox.com/security/cve/CVE-2026-43392",
  "summary": "CVE-2026-43392 is fixed in 80 products on 1 platform, first by ALAS2023-2026-1594, released April 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Fix starvation of scx_enable() under...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Fix starvation of scx_enable() under fair-class saturation  During scx_enable(), the READY -\u003E ENABLED task switching loop changes the calling thread\u0027s sched_class from fair to ext. Since fair has higher priority than ext, saturating fair-class workloads can indefinitely starve the enable thread, hanging the system. This was introduced when the enable path switched from preempt_disable() to scx_bypass() which doesn\u0027t protect against fair-class starvation. Note that the original preempt_disable() protection wasn\u0027t complete either - in partial switch modes, the calling thread could still be starved after preempt_enable() as it may have been switched to ext class.  Fix it by offloading the enable body to a dedicated system-wide RT (SCHED_FIFO) kthread which cannot be starved by either fair or ext class tasks. scx_enable() lazily creates the kthread on first use and passes the ops pointer through a struct scx_enable_cmd containing the kthread_work, then synchronously waits for completion.  The workfn runs on a different kthread from sch-\u003Ehelper (which runs disable_work), so it can safely flush disable_work on the error path without deadlock.",
  "published": "2026-04-27T09:00:00Z",
  "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": 0.0013,
  "epssPercentile": 0.02636,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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      "fix": "ALAS2023-2026-1594",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1594",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1594",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1594",
      "released": "2026-04-27T09:00:00Z"
    },
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}