CVE-2024-47691

Estado: AnalizadaAlta (7.8)—

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

f2fs: fix to avoid use-after-free in f2fs_stop_gc_thread()

syzbot reports a f2fs bug as below:

The root cause is below race condition, it may cause use-after-free issue in sbi->gc_th pointer.

- remount - f2fs_remount - f2fs_stop_gc_thread - kfree(gc_th) - f2fs_ioc_shutdown - f2fs_do_shutdown - f2fs_stop_gc_thread - kthread_stop(gc_th->f2fs_gc_task) : sbi->gc_thread = NULL;

We will call f2fs_do_shutdown() in two paths: - for f2fs_ioc_shutdown() path, we should grab sb->s_umount semaphore for fixing. - for f2fs_shutdown() path, it's safe since caller has already grabbed sb->s_umount semaphore.

Detalles técnicos trazas, registros y código del informe original

 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_report+0xe8/0x550 mm/kasan/report.c:491
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
 atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline]
 __refcount_add include/linux/refcount.h:184 [inline]
 __refcount_inc include/linux/refcount.h:241 [inline]
 refcount_inc include/linux/refcount.h:258 [inline]
 get_task_struct include/linux/sched/task.h:118 [inline]
 kthread_stop+0xca/0x630 kernel/kthread.c:704
 f2fs_stop_gc_thread+0x65/0xb0 fs/f2fs/gc.c:210
 f2fs_do_shutdown+0x192/0x540 fs/f2fs/file.c:2283
 f2fs_ioc_shutdown fs/f2fs/file.c:2325 [inline]
 __f2fs_ioctl+0x443a/0xbe60 fs/f2fs/file.c:4325
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.24%
Percentil entre todas las CVEs puntuadas: 13
Fecha de la puntuación: 6/10/2026

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).

🎯 Técnicas ATT&CK

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

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1499.004 Application or System Exploitationimpact65 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact55 %

CWE-416 (use-after-free) con AV:L/PR:L permite a usuario local causar DoS o corrupción de memoria; impacto primario negación de servicio, secundario manipulación de datos del kernel.

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

Threat Intelligence Program Restrict File and Directory Permissions Remote Data Storage Filter Network Traffic Execution Prevention Encrypt Sensitive Information

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

Mostrar

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid use-after-free in f2fs_stop_gc_thread()\n\nsyzbot reports a f2fs bug as below:\n\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\n print_report+0xe8/0x550 mm/kasan/report.c:491\n kasan_report+0x143/0x180 mm/kasan/report.c:601\n kasan_check_range+0x282/0x290 mm/kasan/generic.c:189\n instrument_atomic_read_write include/linux/instrumented.h:96 [inline]\n atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline]\n __refcount_add include/linux/refcount.h:184 [inline]\n __refcount_inc include/linux/refcount.h:241 [inline]\n refcount_inc include/linux/refcount.h:258 [inline]\n get_task_struct include/linux/sched/task.h:118 [inline]\n kthread_stop+0xca/0x630 kernel/kthread.c:704\n f2fs_stop_gc_thread+0x65/0xb0 fs/f2fs/gc.c:210\n f2fs_do_shutdown+0x192/0x540 fs/f2fs/file.c:2283\n f2fs_ioc_shutdown fs/f2fs/file.c:2325 [inline]\n __f2fs_ioctl+0x443a/0xbe60 fs/f2fs/file.c:4325\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe root cause is below race condition, it may cause use-after-free\nissue in sbi->gc_th pointer.\n\n- remount\n - f2fs_remount\n  - f2fs_stop_gc_thread\n   - kfree(gc_th)\n\t\t\t\t- f2fs_ioc_shutdown\n\t\t\t\t - f2fs_do_shutdown\n\t\t\t\t  - f2fs_stop_gc_thread\n\t\t\t\t   - kthread_stop(gc_th->f2fs_gc_task)\n   : sbi->gc_thread = NULL;\n\nWe will call f2fs_do_shutdown() in two paths:\n- for f2fs_ioc_shutdown() path, we should grab sb->s_umount semaphore\nfor fixing.\n- for f2fs_shutdown() path, it's safe since caller has already grabbed\nsb->s_umount semaphore."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: corrección para evitar el use after free en f2fs_stop_gc_thread() syzbot informa un error de f2fs como el siguiente: __dump_stack lib/dump_stack.c:88 [en línea] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_report+0xe8/0x550 mm/kasan/report.c:491 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [en línea] atomic_fetch_add_relaxed incluir/linux/atomic/atomic-instrumented.h:252 [en línea] __refcount_add incluir/linux/refcount.h:184 [en línea] __refcount_inc incluir/linux/refcount.h:241 [en línea] refcount_inc incluir/linux/refcount.h:258 [en línea] obtener_estructura_de_tareas incluir/linux/sched/task.h:118 [en línea] kthread_stop+0xca/0x630 kernel/kthread.c:704 f2fs_stop_gc_thread+0x65/0xb0 fs/f2fs/gc.c:210 f2fs_do_shutdown+0x192/0x540 fs/f2fs/file.c:2283 f2fs_ioc_shutdown fs/f2fs/file.c:2325 [en línea] __f2fs_ioctl+0x443a/0xbe60 fs/f2fs/file.c:4325 vfs_ioctl fs/ioctl.c:51 [en línea] __do_sys_ioctl fs/ioctl.c:907 [en línea] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [en línea] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f La causa raíz está a continuación de la condición de ejecución, puede causar un problema de use after free en el puntero sbi-&gt;gc_th. - remontar - f2fs_remount - f2fs_stop_gc_thread - kfree(gc_th) - f2fs_ioc_shutdown - f2fs_do_shutdown - f2fs_stop_gc_thread - kthread_stop(gc_th-&gt;f2fs_gc_task) : sbi-&gt;gc_thread = NULL; Llamaremos a f2fs_do_shutdown() en dos rutas: - para la ruta f2fs_ioc_shutdown(), debemos tomar el semáforo sb-&gt;s_umount para arreglarlo. - para la ruta f2fs_shutdown(), es seguro ya que el llamador ya ha tomado el semáforo sb-&gt;s_umount."
    }
  ],
  "lastModified": "2026-06-17T07:57:33.040",
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