---
id: CVE-2026-23452
title: 'PM: runtime: Fix a race condition related to device removal'
summary: |-
  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…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 <
    20f6e2e22a9c6234113812d5f300d3e952a82721
  - >-
    Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 <
    b6dd1a562ca8ba96c8ecb247c62b73f9fa02d47e
  - >-
    Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 <
    5649b46af8b167259e8a8e4e7eb3667ce74554b5
  - >-
    Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 <
    39f2d86f2ddde8d1beda05732f30c7cd945e0b5a
  - >-
    Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 <
    c6febaacfb8a0aec7d771a0e6c21cd68102d5679
  - >-
    Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 <
    bb081fd37f8312651140d7429557258afe51693d
  - >-
    Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 <
    cf65a77c0f9531eb6cfb97cc040974d2d8fff043
  - >-
    Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 <
    29ab768277617452d88c0607c9299cdc63b6e9ff
  - Linux 2.6.32
published: '2026-04-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:46:18.859Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23452'
references:
  - url: 'https://git.kernel.org/stable/c/20f6e2e22a9c6234113812d5f300d3e952a82721'
  - url: 'https://git.kernel.org/stable/c/b6dd1a562ca8ba96c8ecb247c62b73f9fa02d47e'
  - url: 'https://git.kernel.org/stable/c/5649b46af8b167259e8a8e4e7eb3667ce74554b5'
  - url: 'https://git.kernel.org/stable/c/39f2d86f2ddde8d1beda05732f30c7cd945e0b5a'
  - url: 'https://git.kernel.org/stable/c/c6febaacfb8a0aec7d771a0e6c21cd68102d5679'
  - url: 'https://git.kernel.org/stable/c/bb081fd37f8312651140d7429557258afe51693d'
  - url: 'https://git.kernel.org/stable/c/cf65a77c0f9531eb6cfb97cc040974d2d8fff043'
  - url: 'https://git.kernel.org/stable/c/29ab768277617452d88c0607c9299cdc63b6e9ff'
tags:
  - cve.org
epss: 0.00091
epssPercentile: 0.00462
ingestedAt: '2026-09-08T15:33:26.992Z'
---

## Overview

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+0x42/0x60
 lock_acquire.part.0+0x38/0x230
 lock_acquire+0x70/0x160
 _raw_spin_lock+0x36/0x50
 rpm_suspend+0xc6a/0xfe0
 rpm_idle+0x578/0x770
 pm_runtime_work+0xee/0x120
 process_one_work+0xde3/0x1410
 worker_thread+0x5eb/0xfe0
 kthread+0x37b/0x480
 ret_from_fork+0x6cb/0x920
 ret_from_fork_asm+0x11/0x20
 </TASK>

Allocated by task 4314:
 kasan_save_stack+0x2a/0x50
 kasan_save_track+0x18/0x40
 kasan_save_alloc_info+0x3d/0x50
 __kasan_kmalloc+0xa0/0xb0
 __kmalloc_noprof+0x311/0x990
 scsi_alloc_target+0x122/0xb60 [scsi_mod]
 __scsi_scan_target+0x101/0x460 [scsi_mod]
 scsi_scan_channel+0x179/0x1c0 [scsi_mod]
 scsi_scan_host_selected+0x259/0x2d0 [scsi_mod]
 store_scan+0x2d2/0x390 [scsi_mod]
 dev_attr_store+0x43/0x80
 sysfs_kf_write+0xde/0x140
 kernfs_fop_write_iter+0x3ef/0x670
 vfs_write+0x506/0x1470
 ksys_write+0xfd/0x230
 __x64_sys_write+0x76/0xc0
 x64_sys_call+0x213/0x1810
 do_syscall_64+0xee/0xfc0
 entry_SYSCALL_64_after_hwframe+0x4b/0x53

Freed by task 4314:
 kasan_save_stack+0x2a/0x50
 kasan_save_track+0x18/0x40
 kasan_save_free_info+0x3f/0x50
 __kasan_slab_free+0x67/0x80
 kfree+0x225/0x6c0
 scsi_target_dev_release+0x3d/0x60 [scsi_mod]
 device_release+0xa3/0x220
 kobject_cleanup+0x105/0x3a0
 kobject_put+0x72/0xd0
 put_device+0x17/0x20
 scsi_device_dev_release+0xacf/0x12c0 [scsi_mod]
 device_release+0xa3/0x220
 kobject_cleanup+0x105/0x3a0
 kobject_put+0x72/0xd0
 put_device+0x17/0x20
 scsi_device_put+0x7f/0xc0 [scsi_mod]
 sdev_store_delete+0xa5/0x120 [scsi_mod]
 dev_attr_store+0x43/0x80
 sysfs_kf_write+0xde/0x140
 kernfs_fop_write_iter+0x3ef/0x670
 vfs_write+0x506/0x1470
 ksys_write+0xfd/0x230
 __x64_sys_write+0x76/0xc0
 x64_sys_call+0x213/0x1810

## Affected

- `Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 < 20f6e2e22a9c6234113812d5f300d3e952a82721`
- `Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 < b6dd1a562ca8ba96c8ecb247c62b73f9fa02d47e`
- `Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 < 5649b46af8b167259e8a8e4e7eb3667ce74554b5`
- `Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 < 39f2d86f2ddde8d1beda05732f30c7cd945e0b5a`
- `Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 < c6febaacfb8a0aec7d771a0e6c21cd68102d5679`
- `Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 < bb081fd37f8312651140d7429557258afe51693d`
- `Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 < cf65a77c0f9531eb6cfb97cc040974d2d8fff043`
- `Linux >= 5e928f77a09a07f9dd595bb8a489965d69a83458 < 29ab768277617452d88c0607c9299cdc63b6e9ff`
- `Linux 2.6.32`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.