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

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Summary

CVECVE-2026-53326
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-01 14:16:40 UTC
Updated2026-07-04 12:17:00 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.061370000 (date 2026-07-03)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 13abb2b11ac3b6cb89822f152e770081893e4bc3 3cc90ea0dd0fb1f8db577dcdc027fc46c06049f6 git Not specified
CNA Linux Linux affected 0d2a64411b0974a469ff56e62441055147e5a194 5d95f6b267f3d7fe54f42a3b224bb4a3d3990b41 git Not specified
CNA Linux Linux affected c93859a52b0d6953cdaa17fd7fb46a6871b015cf 27335c50014102e9077b784ebd314954286afcab git Not specified
CNA Linux Linux affected a460935022f512e167b4c5d4c12d85f89ba6aabd 44b8b03a9fb5c575548fc72c674653d6baba142a git Not specified
CNA Linux Linux affected 06e0ae988f6e3499785c407429953ade19c1096b 7bc71bdb1c1526c7f02a6adab324394ff1327b0a git Not specified
CNA Linux Linux affected 06e0ae988f6e3499785c407429953ade19c1096b 0d046ae106255cba5eb83b23f78ee93f3620247d git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/27335c50014102e9077b784ebd314954286afcab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/44b8b03a9fb5c575548fc72c674653d6baba142a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0d046ae106255cba5eb83b23f78ee93f3620247d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7bc71bdb1c1526c7f02a6adab324394ff1327b0a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d95f6b267f3d7fe54f42a3b224bb4a3d3990b41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3cc90ea0dd0fb1f8db577dcdc027fc46c06049f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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