CVE-2022-49380

Estado: AnalizadaMedia (5.5)—

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

f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count()

As Yanming reported in bugzilla:

https://bugzilla.kernel.org/show_bug.cgi?id=215897

I have encountered a bug in F2FS file system in kernel v5.17.

The kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can reproduce the bug by running the following commands:

The kernel message is shown below:

The root cause is: .total_valid_block_count or .total_valid_node_count could fuzzed to zero, then once dec_valid_node_count() was called, it will cause BUG_ON(), this patch fixes to print warning info and set SBI_NEED_FSCK into CP instead of panic.

Detalles técnicos trazas, registros y código del informe original

kernel BUG at fs/f2fs/f2fs.h:2511!
Call Trace:
 f2fs_remove_inode_page+0x2a2/0x830
 f2fs_evict_inode+0x9b7/0x1510
 evict+0x282/0x4e0
 do_unlinkat+0x33a/0x540
 __x64_sys_unlinkat+0x8e/0xd0
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x44/0xae

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: 0.26%
Percentil entre todas las CVEs puntuadas: 16
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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

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  "id": "CVE-2022-49380",
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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",
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count()\n\nAs Yanming reported in bugzilla:\n\nhttps://bugzilla.kernel.org/show_bug.cgi?id=215897\n\nI have encountered a bug in F2FS file system in kernel v5.17.\n\nThe kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can\nreproduce the bug by running the following commands:\n\nThe kernel message is shown below:\n\nkernel BUG at fs/f2fs/f2fs.h:2511!\nCall Trace:\n f2fs_remove_inode_page+0x2a2/0x830\n f2fs_evict_inode+0x9b7/0x1510\n evict+0x282/0x4e0\n do_unlinkat+0x33a/0x540\n __x64_sys_unlinkat+0x8e/0xd0\n do_syscall_64+0x3b/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is: .total_valid_block_count or .total_valid_node_count\ncould fuzzed to zero, then once dec_valid_node_count() was called, it\nwill cause BUG_ON(), this patch fixes to print warning info and set\nSBI_NEED_FSCK into CP instead of panic."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: corrección para evitar f2fs_bug_on() en dec_valid_node_count() Como informó Yanming en bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215897 He encontrado un error en el sistema de archivos F2FS en el kernel v5.17. El kernel debería habilitar CONFIG_KASAN=y y CONFIG_KASAN_INLINE=y. Puede reproducir el error ejecutando los siguientes comandos: El mensaje del kernel se muestra a continuación: kernel BUG at fs/f2fs/f2fs.h:2511! Call Trace: f2fs_remove_inode_page+0x2a2/0x830 f2fs_evict_inode+0x9b7/0x1510 evict+0x282/0x4e0 do_unlinkat+0x33a/0x540 __x64_sys_unlinkat+0x8e/0xd0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae The root cause is: .total_valid_block_count or .total_valid_node_count could fuzzed to zero, then once dec_valid_node_count() was called, it will cause BUG_ON(), este parche corrige la impresión de información de advertencia y la configuración de SBI_NEED_FSCK en CP en lugar de pánico."
    }
  ],
  "lastModified": "2026-08-15T13:17:21.003",
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