CVE-2026-31480 tracing: Fix potential deadlock in cpu hotplug with osnoise
A race condition in the Linux kernel osnoise tracer can cause a deadlock during CPU hotplug events, leading to system denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31480?
CVE-2026-31480 is a medium-severity vulnerability in Linux kernel, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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).
Weakness: CWE-667
Which versions are affected by CVE-2026-31480?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31480?
Apply the vendor's patch.
Is CVE-2026-31480 being exploited?
There is no known exploitation of CVE-2026-31480 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31480, DEBIAN-CVE-2026-31480, GHSA-mvjq-gq62-vxrr, ROOT-OS-DEBIAN-12-CVE-2026-31480, ROOT-OS-DEBIAN-13-CVE-2026-31480, ROOT-OS-UBUNTU-2204-CVE-2026-31480 and 2 more.