Linux Kernel up to 7.0.12 debugobjects fill_pool deadlock

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 7.0.12. Affected by this vulnerability is the function fill_pool of the component debugobjects. Executing a manipulation can lead to deadlock. This vulnerability is handled as CVE-2026-53326. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.0.12. It has been declared as critical. This vulnerability affects the function fill_pool of the component debugobjects. The manipulation with an unknown input leads to a deadlock vulnerability. The CWE definition for the vulnerability is CWE-833. The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-53326 since 06/09/2026. The exploitation appears to be difficult. There are known technical details, but no exploit is available.

Upgrading to version 7.0.13 eliminates this vulnerability. Applying the patch 44b8b03a9fb5c575548fc72c674653d6baba142a/7bc71bdb1c1526c7f02a6adab324394ff1327b0a/0d046ae106255cba5eb83b23f78ee93f3620247d is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 7.0.11
• 7.0.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

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