CVE-2026-31480

Received Received - Intake

Deadlock Vulnerability in Linux Kernel CPU Hotplug Tracing

Publication date: 2026-04-22

Last updated on: 2026-04-27

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix potential deadlock in cpu hotplug with osnoise The following sequence may leads deadlock in cpu hotplug: task1 task2 task3 ----- ----- ----- mutex_lock(&interface_lock) [CPU GOING OFFLINE] cpus_write_lock(); osnoise_cpu_die(); kthread_stop(task3); wait_for_completion(); osnoise_sleep(); mutex_lock(&interface_lock); cpus_read_lock(); [DEAD LOCK] Fix by swap the order of cpus_read_lock() and mutex_lock(&interface_lock).

CVSS Scores

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Meta Information

Published

2026-04-22

Last Modified

2026-04-27

Generated

2026-07-06

AI Q&A

2026-04-22

EPSS Evaluated

2026-07-05

NVD

CVE-2026-31480

EUVD

EUVD-2026-24839

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	5.14
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	From 5.14.1 (inc) to 5.15.203 (exc)
linux	linux_kernel	From 5.16 (inc) to 6.1.168 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.21 (exc)
linux	linux_kernel	From 6.19 (inc) to 6.19.11 (exc)
linux	linux_kernel	From 6.2 (inc) to 6.6.131 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.80 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-667	The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Attack-Flow Graph

Executive Summary

This vulnerability is a potential deadlock issue in the Linux kernel related to CPU hotplug operations involving the osnoise component.

The deadlock occurs due to an improper locking sequence between mutex_lock(&interface_lock) and cpus_read_lock() during CPU offline events, where multiple tasks try to acquire locks in conflicting orders, causing the system to hang.

The fix involves swapping the order of cpus_read_lock() and mutex_lock(&interface_lock) to prevent the deadlock.

Impact Analysis

This vulnerability can cause the Linux kernel to deadlock during CPU hotplug operations, which means the system could hang or become unresponsive when CPUs are taken offline.

Such deadlocks can lead to system instability, degraded performance, or require a reboot to recover, impacting availability.

Mitigation Strategies

The vulnerability is fixed by swapping the order of cpus_read_lock() and mutex_lock(&interface_lock) in the Linux kernel code to prevent a potential deadlock during CPU hotplug operations involving osnoise.

To mitigate this vulnerability immediately, you should update your Linux kernel to a version that includes this fix.

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