{
  "cveId": "CVE-2026-43326",
  "url": "https://patchblox.com/security/cve/CVE-2026-43326",
  "summary": "CVE-2026-43326 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43326 (version 6.19.12-1), 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_ext: Fix SCX_KICK_WAIT deadlock by deferri...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  sched_ext: Fix SCX_KICK_WAIT deadlock by deferring wait to balance callback  SCX_KICK_WAIT busy-waits in kick_cpus_irq_workfn() using smp_cond_load_acquire() until the target CPU\u0027s kick_sync advances. Because the irq_work runs in hardirq context, the waiting CPU cannot reschedule and its own kick_sync never advances. If multiple CPUs form a wait cycle, all CPUs deadlock.  Replace the busy-wait in kick_cpus_irq_workfn() with resched_curr() to force the CPU through do_pick_task_scx(), which queues a balance callback to perform the wait. The balance callback drops the rq lock and enables IRQs following the sched_core_balance() pattern, so the CPU can process IPIs while waiting. The local CPU\u0027s kick_sync is advanced on entry to do_pick_task_scx() and continuously during the wait, ensuring any CPU that starts waiting for us sees the advancement and cannot form cyclic dependencies.",
  "published": "2026-05-08T14:16:42Z",
  "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": 0.00083,
  "epssPercentile": 0.00225,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.12-1",
      "fix": "DEBIAN-CVE-2026-43326",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43326",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}