CVE-2025-38335

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

Input: gpio-keys - fix a sleep while atomic with PREEMPT_RT

When enabling PREEMPT_RT, the gpio_keys_irq_timer() callback runs in hard irq context, but the input_event() takes a spin_lock, which isn't allowed there as it is converted to a rt_spin_lock().

Considering the gpio_keys_irq_isr() can run in any context, e.g. it can be threaded, it seems there's no point in requesting the timer isr to run in hard irq context.

Relax the hrtimer not to use the hard context.

Detalles técnicos trazas, registros y código del informe original

[ 4054.289999] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
[ 4054.290028] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/0
...
[ 4054.290195]  __might_resched+0x13c/0x1f4
[ 4054.290209]  rt_spin_lock+0x54/0x11c
[ 4054.290219]  input_event+0x48/0x80
[ 4054.290230]  gpio_keys_irq_timer+0x4c/0x78
[ 4054.290243]  __hrtimer_run_queues+0x1a4/0x438
[ 4054.290257]  hrtimer_interrupt+0xe4/0x240
[ 4054.290269]  arch_timer_handler_phys+0x2c/0x44
[ 4054.290283]  handle_percpu_devid_irq+0x8c/0x14c
[ 4054.290297]  handle_irq_desc+0x40/0x58
[ 4054.290307]  generic_handle_domain_irq+0x1c/0x28
[ 4054.290316]  gic_handle_irq+0x44/0xcc

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.13%
Percentil entre todas las CVEs puntuadas: 2
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Debian — Debian Linux Linux — Linux Kernel

CWE

CWE-667

Referencias

JSON original (NVD)

Mostrar

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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: gpio-keys - fix a sleep while atomic with PREEMPT_RT\n\nWhen enabling PREEMPT_RT, the gpio_keys_irq_timer() callback runs in\nhard irq context, but the input_event() takes a spin_lock, which isn't\nallowed there as it is converted to a rt_spin_lock().\n\n[ 4054.289999] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n[ 4054.290028] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/0\n...\n[ 4054.290195]  __might_resched+0x13c/0x1f4\n[ 4054.290209]  rt_spin_lock+0x54/0x11c\n[ 4054.290219]  input_event+0x48/0x80\n[ 4054.290230]  gpio_keys_irq_timer+0x4c/0x78\n[ 4054.290243]  __hrtimer_run_queues+0x1a4/0x438\n[ 4054.290257]  hrtimer_interrupt+0xe4/0x240\n[ 4054.290269]  arch_timer_handler_phys+0x2c/0x44\n[ 4054.290283]  handle_percpu_devid_irq+0x8c/0x14c\n[ 4054.290297]  handle_irq_desc+0x40/0x58\n[ 4054.290307]  generic_handle_domain_irq+0x1c/0x28\n[ 4054.290316]  gic_handle_irq+0x44/0xcc\n\nConsidering the gpio_keys_irq_isr() can run in any context, e.g. it can\nbe threaded, it seems there's no point in requesting the timer isr to\nrun in hard irq context.\n\nRelax the hrtimer not to use the hard context."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Entrada: gpio-keys - corrige un fallo de suspensión mientras es atómico con PREEMPT_RT Al habilitar PREEMPT_RT, la devolución de llamada gpio_keys_irq_timer() se ejecuta en un contexto de irq duro, pero input_event() toma un spin_lock, que no está permitido allí ya que se convierte en un rt_spin_lock(). [ 4054.289999] ERROR: función de suspensión llamada desde un contexto no válido en kernel/locking/spinlock_rt.c:48 [ 4054.290028] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/0 ... [ 4054.290195] __might_resched+0x13c/0x1f4 [ 4054.290209] rt_spin_lock+0x54/0x11c [ 4054.290219] input_event+0x48/0x80 [ 4054.290230] gpio_keys_irq_timer+0x4c/0x78 [ 4054.290243] __hrtimer_run_queues+0x1a4/0x438 [ 4054.290257] hrtimer_interrupt+0xe4/0x240 [ 4054.290269] arch_timer_handler_phys+0x2c/0x44 [ 4054.290283] handle_percpu_devid_irq+0x8c/0x14c [ 4054.290297] handle_irq_desc+0x40/0x58 [ 4054.290307] generic_handle_domain_irq+0x1c/0x28 [ 4054.290316] gic_handle_irq+0x44/0xcc Teniendo en cuenta que gpio_keys_irq_isr() puede ejecutarse en cualquier contexto, por ejemplo, puede ser Enhebrado, parece que no tiene sentido solicitar que el temporizador ISR se ejecute en un contexto de IRQ estricto. Reduzca la velocidad del temporizador hr para que no use dicho contexto."
    }
  ],
  "lastModified": "2026-06-17T09:16:38.870",
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