---
id: CVE-2026-64373
title: |-
  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
summary: |-
  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…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-362
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.4.198, < 4.5'
  - 'linux_kernel >= 4.9.198, < 4.10'
  - 'linux_kernel >= 4.14.151, < 4.15'
  - 'linux_kernel >= 4.19.81, < 4.20'
  - 'linux_kernel >= 5.3.8, < 5.4'
  - 'linux_kernel >= 5.4.1, < 5.10.261'
  - 'linux_kernel >= 5.11, < 5.15.212'
  - 'linux_kernel >= 5.16, < 6.1.178'
  - 'linux_kernel >= 6.2, < 6.6.145'
  - 'linux_kernel >= 6.7, < 6.12.96'
  - 'linux_kernel >= 6.13, < 6.18.39'
  - 'linux_kernel >= 6.19, < 7.1.4'
  - linux_kernel = 5.4
patched:
  - linux_kernel 7.1.4
published: '2026-07-25'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T15:23:15.967'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64373'
references:
  - url: 'https://git.kernel.org/stable/c/6d5dd354c37abaf4d60400c55c71f23ba2b33639'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6e175c00c62dca3d91b987015808b5d52e8db2b4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/73255d702c7560185fd5951aadcf7eb057c2f453'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9103078c7b3091a2fbb52af176f95982ee7dd7f8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a0ef2fc89d28ca62923376c4b8ffaa57136a36be'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a9029dd55696c651ee46912afa2a166fa456bb3e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cd4524ff6567fa4458a5bec4b017105e671d393e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64373.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-64373'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507271'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-64373'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64373'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026072523-CVE-2026-64373-2ee3@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00089
epssPercentile: 0.00407
ingestedAt: '2026-09-08T15:33:26.948Z'
scores:
  nvd: 4.7
  vendor: 5.5
---

## Overview

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 ]

## Affected

- `linux_kernel >= 4.4.198, < 4.5`
- `linux_kernel >= 4.9.198, < 4.10`
- `linux_kernel >= 4.14.151, < 4.15`
- `linux_kernel >= 4.19.81, < 4.20`
- `linux_kernel >= 5.3.8, < 5.4`
- `linux_kernel >= 5.4.1, < 5.10.261`
- `linux_kernel >= 5.11, < 5.15.212`
- `linux_kernel >= 5.16, < 6.1.178`
- `linux_kernel >= 6.2, < 6.6.145`
- `linux_kernel >= 6.7, < 6.12.96`
- `linux_kernel >= 6.13, < 6.18.39`
- `linux_kernel >= 6.19, < 7.1.4`
- `linux_kernel = 5.4`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.1.4`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64373.json)