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CVE-2022-49348

Estado: AnalizadaMedia (5.5)—

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

ext4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state

The EXT4_FC_REPLAY bit in sbi->s_mount_state is used to indicate that we are in the middle of replay the fast commit journal. This was actually a mistake, since the sbi->s_mount_info is initialized from es->s_state. Arguably s_mount_state is misleadingly named, but the name is historical --- s_mount_state and s_state dates back to ext2.

What should have been used is the ext4_{set,clear,test}_mount_flag() inline functions, which sets EXT4_MF_* bits in sbi->s_mount_flags.

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The problem with using EXT4_FC_REPLAY is that a maliciously corrupted superblock could result in EXT4_FC_REPLAY getting set in s_mount_state. This bypasses some sanity checks, and this can trigger a BUG() in ext4_es_cache_extent(). As a easy-to-backport-fix, filter out the EXT4_FC_REPLAY bit for now. We should eventually transition away from EXT4_FC_REPLAY to something like EXT4_MF_REPLAY.

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-49348",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
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          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "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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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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          "programFiles": [
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  "published": "2025-02-26T07:01:11.533",
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state\n\nThe EXT4_FC_REPLAY bit in sbi->s_mount_state is used to indicate that\nwe are in the middle of replay the fast commit journal.  This was\nactually a mistake, since the sbi->s_mount_info is initialized from\nes->s_state.  Arguably s_mount_state is misleadingly named, but the\nname is historical --- s_mount_state and s_state dates back to ext2.\n\nWhat should have been used is the ext4_{set,clear,test}_mount_flag()\ninline functions, which sets EXT4_MF_* bits in sbi->s_mount_flags.\n\nThe problem with using EXT4_FC_REPLAY is that a maliciously corrupted\nsuperblock could result in EXT4_FC_REPLAY getting set in\ns_mount_state.  This bypasses some sanity checks, and this can trigger\na BUG() in ext4_es_cache_extent().  As a easy-to-backport-fix, filter\nout the EXT4_FC_REPLAY bit for now.  We should eventually transition\naway from EXT4_FC_REPLAY to something like EXT4_MF_REPLAY."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: filtrar EXT4_FC_REPLAY del campo s_state del superbloque en disco El bit EXT4_FC_REPLAY en sbi->s_mount_state se usa para indicar que estamos en medio de la reproducción del diario de confirmación rápida. En realidad, esto fue un error, ya que sbi->s_mount_info se inicializa desde es->s_state. Podría decirse que s_mount_state tiene un nombre engañoso, pero el nombre es histórico --- s_mount_state y s_state se remontan a ext2. Lo que se debería haber usado son las funciones en línea ext4_{set,clear,test}_mount_flag(), que establecen los bits EXT4_MF_* en sbi->s_mount_flags. El problema con el uso de EXT4_FC_REPLAY es que un superbloque dañado maliciosamente podría provocar que EXT4_FC_REPLAY se establezca en s_mount_state. Esto evita algunas comprobaciones de cordura y puede desencadenar un error en ext4_es_cache_extent(). Como solución fácil de implementar, filtre el bit EXT4_FC_REPLAY por ahora. Deberíamos dejar de usar EXT4_FC_REPLAY para pasar a algo como EXT4_MF_REPLAY."
    }
  ],
  "lastModified": "2026-06-17T05:17:47.273",
  "configurations": [
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