{"id":"CVE-2026-53326","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ndebugobjects: Don't call fill_pool() in early boot hardirq context\n\nWhen booting a debug PREEMPT_RT kernel on an ARM64 system, a \"inconsistent\n{HARDIRQ-ON-W} -> {IN-HAR…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndebugobjects: Don't call fill_pool() in early boot hardirq context\n\nWhen booting a debug PREEMPT_RT kernel on an ARM64 system, a \"inconsistent\n{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":0.02583,"ingestedAt":"2026-07-04T13:56:11.998Z","slug":"CVE-2026-53326","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndebugobjects: Don't call fill_pool() in early boot hardirq context\n\nWhen booting a debug PREEMPT_RT kernel on an ARM64 system, a \"inconsistent\n{HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage\" lockdep warning message was\nreported to the console.\n\nDuring early boot, interrupts are enabled before the scheduler is\nenabled. In this window (before SYSTEM_SCHEDULING is set) interrupts can\nfire and in the hard interrupt context handler attempt to fill the pool\n\nThis can lead to a deadlock when the interrupt occurred when the interrupt\nhits a region which holds a lock that is required to be taken in the\nallocation path.\n\nAdd a new can_fill_pool() helper and reorder the exception rule and forbid\nthis scenario by excluding allocations from hard interrupt context.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}