{
  "cveId": "CVE-2026-64250",
  "url": "https://patchblox.com/security/cve/CVE-2026-64250",
  "summary": "CVE-2026-64250 is fixed in 38 products on 1 platform, first by ALAS2023-2026-1969, released July 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "LoongArch: Report dying CPU to RCU in stop_this_cpu()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  LoongArch: Report dying CPU to RCU in stop_this_cpu()  This is a port of MIPS commit 9f3f3bdc6d9dac1 (\u0022MIPS: smp: report dying CPU to RCU in stop_this_cpu()\u0022). smp_send_stop() parks all secondary CPUs in stop_this_cpu(). And the function marks the CPU offline for the scheduler via set_cpu_online(false) but never informs RCU, so RCU keeps expecting a quiescent state from CPUs that are now spinning forever with interrupts disabled.  As long as nothing waits for an RCU grace period after smp_send_stop() this is harmless, which is why it went unnoticed. However, since commit 91840be8f710370 (\u0022irq_work: Fix use-after-free in irq_work_single() on PREEMPT_RT\u0022), irq_work_sync() calls synchronize_rcu() on architectures without an irq_work self-IPI, i.e. where arch_irq_work_has_interrupt() returns false. Any irq_work_sync() issued in the reboot/shutdown/halt path after smp_send_stop() then blocks on a grace period that can never complete, hanging the reboot:    WARNING: CPU: 0 PID: 15 at kernel/irq_work.c:144 irq_work_queue_on   ...   rcu: INFO: rcu_sched detected stalls on CPUs/tasks:   rcu: Offline CPU 1 blocking current GP.   rcu: Offline CPU 2 blocking current GP.   rcu: Offline CPU 3 blocking current GP.  This issue needs some hacks to reproduce, and it was not noticed on LoongArch because arch_irq_work_has_interrupt() usually returns true.  Call rcutree_report_cpu_dead() once interrupts are disabled, mirroring the generic CPU-hotplug offline path, so RCU stops waiting on the parked CPUs and grace periods can still complete. LoongArch shuts down all CPUs here without going through the CPU-hotplug mechanism, so this report is not otherwise issued.",
  "published": "2026-07-20T09:00:00Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00158,
  "epssPercentile": 0.04962,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64250",
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      "release": "amzn 2023",
      "fixedVersion": "1:6.12.95-124.187.amzn2023",
      "fix": "ALAS2023-2026-2014",
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  "dataAsOf": "2026-11-10T01:44:33Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}