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CVE-2025-71162

Estado: ModificadaAlta (7.8)—

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

dmaengine: tegra-adma: Fix use-after-free

A use-after-free bug exists in the Tegra ADMA driver when audio streams are terminated, particularly during XRUN conditions. The issue occurs when the DMA buffer is freed by tegra_adma_terminate_all() before the vchan completion tasklet finishes accessing it.

The race condition follows this sequence:

Since tasklets can execute at any time after being scheduled, there is no guarantee that the buffer will remain valid when vchan_complete() runs.

Detalles técnicos trazas, registros y código del informe original
  1. DMA transfer completes, triggering an interrupt that schedules the
     completion tasklet (tasklet has not executed yet)
  2. Audio playback stops, calling tegra_adma_terminate_all() which
     frees the DMA buffer memory via kfree()
  3. The scheduled tasklet finally executes, calling vchan_complete()
     which attempts to access the already-freed memory

Fix this by properly synchronizing the virtual channel completion:
 - Calling vchan_terminate_vdesc() in tegra_adma_stop() to mark the
   descriptors as terminated instead of freeing the descriptor.
 - Add the callback tegra_adma_synchronize() that calls
   vchan_synchronize() which kills any pending tasklets and frees any
   terminated descriptors.

Crash logs:
[  337.427523] BUG: KASAN: use-after-free in vchan_complete+0x124/0x3b0
[  337.427544] Read of size 8 at addr ffff000132055428 by task swapper/0/0

[  337.427562] Call trace:
[  337.427564]  dump_backtrace+0x0/0x320
[  337.427571]  show_stack+0x20/0x30
[  337.427575]  dump_stack_lvl+0x68/0x84
[  337.427584]  print_address_description.constprop.0+0x74/0x2b8
[  337.427590]  kasan_report+0x1f4/0x210
[  337.427598]  __asan_load8+0xa0/0xd0
[  337.427603]  vchan_complete+0x124/0x3b0
[  337.427609]  tasklet_action_common.constprop.0+0x190/0x1d0
[  337.427617]  tasklet_action+0x30/0x40
[  337.427623]  __do_softirq+0x1a0/0x5c4
[  337.427628]  irq_exit+0x110/0x140
[  337.427633]  handle_domain_irq+0xa4/0xe0
[  337.427640]  gic_handle_irq+0x64/0x160
[  337.427644]  call_on_irq_stack+0x20/0x4c
[  337.427649]  do_interrupt_handler+0x7c/0x90
[  337.427654]  el1_interrupt+0x30/0x80
[  337.427659]  el1h_64_irq_handler+0x18/0x30
[  337.427663]  el1h_64_irq+0x7c/0x80
[  337.427667]  cpuidle_enter_state+0xe4/0x540
[  337.427674]  cpuidle_enter+0x54/0x80
[  337.427679]  do_idle+0x2e0/0x380
[  337.427685]  cpu_startup_entry+0x2c/0x70
[  337.427690]  rest_init+0x114/0x130
[  337.427695]  arch_call_rest_init+0x18/0x24
[  337.427702]  start_kernel+0x380/0x3b4
[  337.427706]  __primary_switched+0xc0/0xc8

CVSS

Probabilidad de explotación (EPSS)

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local (AV:L, PR:L) que permite ejecución de código arbitrario explotando use-after-free en kernel Linux; impacto: ejecución de comandos y denegación de servicio por crash.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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          "value": "CWE-416"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: tegra-adma: Fix use-after-free\n\nA use-after-free bug exists in the Tegra ADMA driver when audio streams\nare terminated, particularly during XRUN conditions. The issue occurs\nwhen the DMA buffer is freed by tegra_adma_terminate_all() before the\nvchan completion tasklet finishes accessing it.\n\nThe race condition follows this sequence:\n\n  1. DMA transfer completes, triggering an interrupt that schedules the\n     completion tasklet (tasklet has not executed yet)\n  2. Audio playback stops, calling tegra_adma_terminate_all() which\n     frees the DMA buffer memory via kfree()\n  3. The scheduled tasklet finally executes, calling vchan_complete()\n     which attempts to access the already-freed memory\n\nSince tasklets can execute at any time after being scheduled, there is\nno guarantee that the buffer will remain valid when vchan_complete()\nruns.\n\nFix this by properly synchronizing the virtual channel completion:\n - Calling vchan_terminate_vdesc() in tegra_adma_stop() to mark the\n   descriptors as terminated instead of freeing the descriptor.\n - Add the callback tegra_adma_synchronize() that calls\n   vchan_synchronize() which kills any pending tasklets and frees any\n   terminated descriptors.\n\nCrash logs:\n[  337.427523] BUG: KASAN: use-after-free in vchan_complete+0x124/0x3b0\n[  337.427544] Read of size 8 at addr ffff000132055428 by task swapper/0/0\n\n[  337.427562] Call trace:\n[  337.427564]  dump_backtrace+0x0/0x320\n[  337.427571]  show_stack+0x20/0x30\n[  337.427575]  dump_stack_lvl+0x68/0x84\n[  337.427584]  print_address_description.constprop.0+0x74/0x2b8\n[  337.427590]  kasan_report+0x1f4/0x210\n[  337.427598]  __asan_load8+0xa0/0xd0\n[  337.427603]  vchan_complete+0x124/0x3b0\n[  337.427609]  tasklet_action_common.constprop.0+0x190/0x1d0\n[  337.427617]  tasklet_action+0x30/0x40\n[  337.427623]  __do_softirq+0x1a0/0x5c4\n[  337.427628]  irq_exit+0x110/0x140\n[  337.427633]  handle_domain_irq+0xa4/0xe0\n[  337.427640]  gic_handle_irq+0x64/0x160\n[  337.427644]  call_on_irq_stack+0x20/0x4c\n[  337.427649]  do_interrupt_handler+0x7c/0x90\n[  337.427654]  el1_interrupt+0x30/0x80\n[  337.427659]  el1h_64_irq_handler+0x18/0x30\n[  337.427663]  el1h_64_irq+0x7c/0x80\n[  337.427667]  cpuidle_enter_state+0xe4/0x540\n[  337.427674]  cpuidle_enter+0x54/0x80\n[  337.427679]  do_idle+0x2e0/0x380\n[  337.427685]  cpu_startup_entry+0x2c/0x70\n[  337.427690]  rest_init+0x114/0x130\n[  337.427695]  arch_call_rest_init+0x18/0x24\n[  337.427702]  start_kernel+0x380/0x3b4\n[  337.427706]  __primary_switched+0xc0/0xc8"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndmaengine: tegra-adma: Corrección de uso después de liberación\n\nExiste un error de uso después de liberación en el controlador Tegra ADMA cuando las transmisiones de audio son terminadas, particularmente durante condiciones XRUN. El problema ocurre cuando el búfer DMA es liberado por tegra_adma_terminate_all() antes de que la tarea de finalización de vchan termine de acceder a él.\n\nLa condición de carrera sigue esta secuencia:\n\n  1. La transferencia DMA se completa, desencadenando una interrupción que programa la tarea de finalización (la tarea aún no se ha ejecutado)\n  2. La reproducción de audio se detiene, llamando a tegra_adma_terminate_all() que libera la memoria del búfer DMA a través de kfree()\n  3. La tarea programada finalmente se ejecuta, llamando a vchan_complete() que intenta acceder a la memoria ya liberada\n\nDado que las tareas pueden ejecutarse en cualquier momento después de ser programadas, no hay garantía de que el búfer permanezca válido cuando se ejecuta vchan_complete().\n\nCorrija esto mediante la sincronización adecuada de la finalización del canal virtual:\n - Llamando a vchan_terminate_vdesc() en tegra_adma_stop() para marcar los descriptores como terminados en lugar de liberar el descriptor.\n - Agregue la función de devolución de llamada tegra_adma_synchronize() que llama a vchan_synchronize() que elimina cualquier tarea pendiente y libera cualquier descriptor terminado.\n\nRegistros de fallos:\n[  337.427523] BUG: KASAN: uso después de liberación en vchan_complete+0x124/0x3b0\n[  337.427544] Lectura de tamaño 8 en la dirección ffff000132055428 por la tarea swapper/0/0\n\n[  337.427562] Traza de llamada:\n[  337.427564]  dump_backtrace+0x0/0x320\n[  337.427571]  show_stack+0x20/0x30\n[  337.427575]  dump_stack_lvl+0x68/0x84\n[  337.427584]  print_address_description.constprop.0+0x74/0x2b8\n[  337.427590]  kasan_report+0x1f4/0x210\n[  337.427598]  __asan_load8+0xa0/0xd0\n[  337.427603]  vchan_complete+0x124/0x3b0\n[  337.427609]  tasklet_action_common.constprop.0+0x190/0x1d0\n[  337.427617]  tasklet_action+0x30/0x40\n[  337.427623]  __do_softirq+0x1a0/0x5c4\n[  337.427628]  irq_exit+0x110/0x140\n[  337.427633]  handle_domain_irq+0xa4/0xe0\n[  337.427640]  gic_handle_irq+0x64/0x160\n[  337.427644]  call_on_irq_stack+0x20/0x4c\n[  337.427649]  do_interrupt_handler+0x7c/0x90\n[  337.427654]  el1_interrupt+0x30/0x80\n[  337.427659]  el1h_64_irq_handler+0x18/0x30\n[  337.427663]  el1h_64_irq+0x7c/0x80\n[  337.427667]  cpuidle_enter_state+0xe4/0x540\n[  337.427674]  cpuidle_enter+0x54/0x80\n[  337.427679]  do_idle+0x2e0/0x380\n[  337.427685]  cpu_startup_entry+0x2c/0x70\n[  337.427690]  rest_init+0x114/0x130\n[  337.427695]  arch_call_rest_init+0x18/0x24\n[  337.427702]  start_kernel+0x380/0x3b4\n[  337.427706]  __primary_switched+0xc0/0xc8"
    }
  ],
  "lastModified": "2026-07-30T06:24:55.260",
  "configurations": [
    {
      "nodes": [
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