# CVE-2025-71180: linux: In the Linux kernel, the following vulnerability has been resolved:  counter: interrupt-cnt: Drop IRQF_NO_THREAD flag...

CVE-2025-71180 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-71180, released January 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-71180
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 31, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.162-1 | [DEBIAN-CVE-2025-71180](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71180.md) | Jan 31, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2025-71180](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71180.md) | Jan 31, 2026 |
| Linux | linux Debian 14 | 6.18.8-1 | [DEBIAN-CVE-2025-71180](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71180.md) | Jan 31, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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