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CVE-2026-31480: tracing: Fix potential deadlock in cpu hotplug with osnoise

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-06-17
• Weakness: CWE-667

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).

Affected products

• Linux kernel: from 5.14.1 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11 — fixed in 5.15.203, 6.1.168, 6.12.80, 6.18.21, 6.19.11, 6.6.131

How to fix

Upgrade to a fixed version: Linux kernel 5.15.203, 6.1.168, 6.12.80, 6.18.21. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/03474a01c199de17a8e2d39b51df6beb9c76e831
• https://git.kernel.org/stable/c/1f9885732248d22f788e4992c739a98c88ab8a55
• https://git.kernel.org/stable/c/7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f
• https://git.kernel.org/stable/c/7aa095ce7d224308cb6979956f0de8607df93d4f
• https://git.kernel.org/stable/c/cf929c21eeed5bd39873fb14bfdfff963fa6f1da
• https://git.kernel.org/stable/c/ef41a85a55022e27cdaebf22a6676910b66f65aa
• https://git.kernel.org/stable/c/f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7

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