Linux Kernel up to 7.1.3 cpufreq cpufreq_suspend null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.0$0-$5k3.99

Summaryinfo

A vulnerability described as problematic has been identified in Linux Kernel up to 7.1.3. Affected by this issue is the function cpufreq_suspend of the component cpufreq. Executing a manipulation can lead to null pointer dereference. The identification of this vulnerability is CVE-2026-64373. The attack can only be executed locally. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.3. It has been declared as problematic. This vulnerability affects the function cpufreq_suspend of the component cpufreq. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

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 ]

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-64373 since 07/19/2026. The exploitation appears to be easy. The attack needs to be approached locally. Additional levels of successful authentication are needed for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch 6d5dd354c37abaf4d60400c55c71f23ba2b33639/9103078c7b3091a2fbb52af176f95982ee7dd7f8/cd4524ff6567fa4458a5bec4b017105e671d393e/73255d702c7560185fd5951aadcf7eb057c2f453/a0ef2fc89d28ca62923376c4b8ffaa57136a36be/6e175c00c62dca3d91b987015808b5d52e8db2b4/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53/a9029dd55696c651ee46912afa2a166fa456bb3e is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.2
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.2
VulDB Temp Score: 4.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc1
Patch: 6d5dd354c37abaf4d60400c55c71f23ba2b33639/9103078c7b3091a2fbb52af176f95982ee7dd7f8/cd4524ff6567fa4458a5bec4b017105e671d393e/73255d702c7560185fd5951aadcf7eb057c2f453/a0ef2fc89d28ca62923376c4b8ffaa57136a36be/6e175c00c62dca3d91b987015808b5d52e8db2b4/a0106b41f9a724868d390b8b3b4ea5ca0e04ea53/a9029dd55696c651ee46912afa2a166fa456bb3e

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64373 (🔒)
GCVE (CVE): GCVE-0-2026-64373
GCVE (VulDB): GCVE-100-383164

Entryinfo

Created: 07/25/2026 17:29
Changes: 07/25/2026 17:29 (59)
Complete: 🔍
Cache ID: 216::103

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