CVE-2026-23452

/// Technical description

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

PM: runtime: Fix a race condition related to device removal

The following code in pm_runtime_work() may dereference the dev->parent

pointer after the parent device has been freed:

/* Maybe the parent is now able to suspend. */

if (parent && !parent->power.ignore_children) {

spin_unlock(&dev->power.lock);

spin_lock(&parent->power.lock);

rpm_idle(parent, RPM_ASYNC);

spin_unlock(&parent->power.lock);

spin_lock(&dev->power.lock);

}

Fix this by inserting a flush_work() call in pm_runtime_remove().

Without this patch blktest block/001 triggers the following complaint

sporadically:

BUG: KASAN: slab-use-after-free in lock_acquire+0x70/0x160

Read of size 1 at addr ffff88812bef7198 by task kworker/u553:1/3081

Workqueue: pm pm_runtime_work

Call Trace:

<TASK>

dump_stack_lvl+0x61/0x80

print_address_description.constprop.0+0x8b/0x310

print_report+0xfd/0x1d7

kasan_report+0xd8/0x1d0

__kasan_check_byte+0x42/0

/// 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