CVE-2026-31480

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxbce29ac9ce0bb0b0b146b687ab978378c21e9078 < cf929c21eeed5bd39873fb14bfdfff963fa6f1daaffected
LinuxLinuxbce29ac9ce0bb0b0b146b687ab978378c21e9078 < 7aa095ce7d224308cb6979956f0de8607df93d4faffected
LinuxLinuxbce29ac9ce0bb0b0b146b687ab978378c21e9078 < ef41a85a55022e27cdaebf22a6676910b66f65aaaffected
LinuxLinuxbce29ac9ce0bb0b0b146b687ab978378c21e9078 < 03474a01c199de17a8e2d39b51df6beb9c76e831affected
LinuxLinuxbce29ac9ce0bb0b0b146b687ab978378c21e9078 < f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7affected
LinuxLinuxbce29ac9ce0bb0b0b146b687ab978378c21e9078 < 7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9faffected
LinuxLinuxbce29ac9ce0bb0b0b146b687ab978378c21e9078 < 1f9885732248d22f788e4992c739a98c88ab8a55affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.131 <= 6.6.*unaffected
LinuxLinux6.12.80 <= 6.12.*unaffected
LinuxLinux6.18.21 <= 6.18.*unaffected
LinuxLinux6.19.11 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References