GHSA-R493-VRRX-V3X2

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

cpufreq: Fix hotplug-suspend race during reboot

During system reboot, cpufreq_suspend() is called via the kernel_restart() -> device_shutdown() path. Unlike the normal system suspend path, the reboot path does not call freeze_processes(), so userspace processes and kernel threads remain active.

This allows CPU hotplug operations to run concurrently with cpufreq_suspend(). The original code has no synchronization with CPU hotplug, leading to a race condition where governor_data can be freed by the hotplug path while cpufreq_suspend() is still accessing it, resulting in a null pointer dereference:

Unable to handle kernel NULL pointer dereference Call Trace: do_kernel_fault+0x28/0x3c cpufreq_suspend+0xdc/0x160 device_shutdown+0x18/0x200 kernel_restart+0x40/0x80 arm64_sys_reboot+0x1b0/0x200

Fix this by adding cpus_read_lock()/cpus_read_unlock() to cpufreq_suspend() to block CPU hotplug operations while suspend is in progress.

[ rjw: Changelog edits ]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64373"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:20Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: Fix hotplug-suspend race during reboot\n\nDuring system reboot, cpufreq_suspend() is called via the\nkernel_restart() -\u003e device_shutdown() path. Unlike the normal system\nsuspend path, the reboot path does not call freeze_processes(), so\nuserspace processes and kernel threads remain active.\n\nThis allows CPU hotplug operations to run concurrently with\ncpufreq_suspend(). The original code has no synchronization with CPU\nhotplug, leading to a race condition where governor_data can be freed\nby the hotplug path while cpufreq_suspend() is still accessing it,\nresulting in a null pointer dereference:\n\n  Unable to handle kernel NULL pointer dereference\n  Call Trace:\n   do_kernel_fault+0x28/0x3c\n   cpufreq_suspend+0xdc/0x160\n   device_shutdown+0x18/0x200\n   kernel_restart+0x40/0x80\n   arm64_sys_reboot+0x1b0/0x200\n\nFix this by adding cpus_read_lock()/cpus_read_unlock() to\ncpufreq_suspend() to block CPU hotplug operations while suspend is in\nprogress.\n\n[ rjw: Changelog edits ]",
  "id": "GHSA-r493-vrrx-v3x2",
  "modified": "2026-07-25T12:31:33Z",
  "published": "2026-07-25T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64373"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e175c00c62dca3d91b987015808b5d52e8db2b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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