CVE-2025-38234

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

sched/rt: Fix race in push_rt_task

Overview

========

When a CPU chooses to call push_rt_task and picks a task to push to

another CPU's runqueue then it will call find_lock_lowest_rq method

which would take a double lock on both CPUs' runqueues. If one of the

locks aren't readily available, it may lead to dropping the current

runqueue lock and reacquiring both the locks at once. During this window

it is possible that the task is already migrated and is running on some

other CPU. These cases are already handled. However, if the task is

migrated and has already been executed and another CPU is now trying to

wake it up (ttwu) such that it is queued again on the runqeue

(on_rq is 1) and also if the task was run by the same CPU, then the

current checks will pass even though the task was migrated out and is no

longer in the pushable tasks list.

Crashes

=======

This bug resulted in quite a few flavors of crashes triggering

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References