---
id: CVE-2026-53326
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  debugobjects: Don't call fill_pool() in early boot hardirq context

  When booting a debug PREEMPT_RT kernel on an ARM64 system, a "inconsistent
  {HARDIRQ-ON-W} -> {IN-HAR…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  debugobjects: Don't call fill_pool() in early boot hardirq context

  When booting a debug PREEMPT_RT kernel on an ARM64 system, a "inconsistent
  {HARDIRQ-ON-W} -> {IN-HAR…
severity: none
published: '2026-07-01'
updated: '2026-07-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53326'
references:
  - url: 'https://git.kernel.org/stable/c/0d046ae106255cba5eb83b23f78ee93f3620247d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/27335c50014102e9077b784ebd314954286afcab'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3cc90ea0dd0fb1f8db577dcdc027fc46c06049f6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/44b8b03a9fb5c575548fc72c674653d6baba142a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5d95f6b267f3d7fe54f42a3b224bb4a3d3990b41'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7bc71bdb1c1526c7f02a6adab324394ff1327b0a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00125
epssPercentile: 0.02577
ingestedAt: '2026-07-04T13:56:11.998Z'
---

## Overview

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

debugobjects: Don't call fill_pool() in early boot hardirq context

When booting a debug PREEMPT_RT kernel on an ARM64 system, a "inconsistent
{HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage" lockdep warning message was
reported to the console.

During early boot, interrupts are enabled before the scheduler is
enabled. In this window (before SYSTEM_SCHEDULING is set) interrupts can
fire and in the hard interrupt context handler attempt to fill the pool

This can lead to a deadlock when the interrupt occurred when the interrupt
hits a region which holds a lock that is required to be taken in the
allocation path.

Add a new can_fill_pool() helper and reorder the exception rule and forbid
this scenario by excluding allocations from hard interrupt context.

## Remediation

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