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CVE-2025-71180

counter: interrupt-cnt: Drop IRQF_NO_THREAD flag PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: counter: interrupt-cnt: Drop IRQF_NO_THREAD flag An IRQ handler can either be IRQF_NO_THREAD or acquire spinlock_t, as CONFIG_PROVE_RAW_LOCK_NESTING warns: ============================= [ BUG: Invalid wait context ] 6.18.0-rc1+git... #1 ----------------------------- some-user-space-process/1251 is trying to lock: (&counter->events_list_lock){....}-{3:3}, at: counter_push_event [counter] other info that might help us debug this: context-{2:2} no locks held by some-user-space-process/.... stack backtrace: CPU: 0 UID: 0 PID: 1251 Comm: some-user-space-process 6.18.0-rc1+git... #1 PREEMPT Call trace: show_stack (C) dump_stack_lvl dump_stack __lock_acquire lock_acquire _raw_spin_lock_irqsave counter_push_event [counter] interrupt_cnt_isr [interrupt_cnt] __handle_irq_event_percpu handle_irq_event handle_simple_irq handle_irq_desc generic_handle_domain_irq gpio_irq_handler handle_irq_desc generic_handle_domain_irq gic_handle_irq call_on_irq_stack do_interrupt_handler el0_interrupt __el0_irq_handler_common el0t_64_irq_handler el0t_64_irq ... and Sebastian correctly points out. Remove IRQF_NO_THREAD as an alternative to switching to raw_spinlock_t, because the latter would limit all potential nested locks to raw_spinlock_t only.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected a55ebd47f21f6f0472766fb52c973849e31d1466 before ef668c9a2261ec9287faba6e6ef05a98b391aa2b; affected a55ebd47f21f6f0472766fb52c973849e31d1466 before 51d2e5d6491447258cb39ff1deb93df15d3c23cb; affected a55ebd47f21f6f0472766fb52c973849e31d1466 before 1c5a3175aecf82cd86dfcbef2a23e8b26d8d8e7c; affected a55ebd47f21f6f0472766fb52c973849e31d1466 before 49a66829dd3653695e60d7cae13521d131362fcd; affected a55ebd47f21f6f0472766fb52c973849e31d1466 before 425886b1f8304621b3f16632b274357067d5f13f; affected a55ebd47f21f6f0472766fb52c973849e31d1466 before 23f9485510c338476b9735d516c1d4aacb810d46
Linux / Linuxaffected 5.13; unaffected 0 before 5.13; unaffected 5.15.198 through 5.15.*; unaffected 6.1.161 through 6.1.*; unaffected 6.6.121 through 6.6.*; unaffected 6.12.66 through 6.12.*; unaffected 6.18.6 through 6.18.*; unaffected 6.19 through *

CWE

No CWE identifiers supplied.

References