CVE-2024-35807

{
  "id": "CVE-2024-35807",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-35807",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-06-12T15:25:51.499528Z"
        }
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        "source": "nvd@nist.gov",
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          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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  "published": "2024-05-17T14:15:14.213",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix corruption during on-line resize\n\nWe observed a corruption during on-line resize of a file system that is\nlarger than 16 TiB with 4k block size. With having more then 2^32 blocks\nresize_inode is turned off by default by mke2fs. The issue can be\nreproduced on a smaller file system for convenience by explicitly\nturning off resize_inode. An on-line resize across an 8 GiB boundary (the\nsize of a meta block group in this setup) then leads to a corruption:\n\n  dev=/dev/<some_dev> # should be >= 16 GiB\n  mkdir -p /corruption\n  /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15))\n  mount -t ext4 $dev /corruption\n\n  dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15))\n  sha1sum /corruption/test\n  # 79d2658b39dcfd77274e435b0934028adafaab11  /corruption/test\n\n  /sbin/resize2fs $dev $((2*2**21))\n  # drop page cache to force reload the block from disk\n  echo 1 > /proc/sys/vm/drop_caches\n\n  sha1sum /corruption/test\n  # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3  /corruption/test\n\n2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per\nblock group and 2^6 are the number of block groups that make a meta\nblock group.\n\nThe last checksum might be different depending on how the file is laid\nout across the physical blocks. The actual corruption occurs at physical\nblock 63*2^15 = 2064384 which would be the location of the backup of the\nmeta block group's block descriptor. During the on-line resize the file\nsystem will be converted to meta_bg starting at s_first_meta_bg which is\n2 in the example - meaning all block groups after 16 GiB. However, in\next4_flex_group_add we might add block groups that are not part of the\nfirst meta block group yet. In the reproducer we achieved this by\nsubstracting the size of a whole block group from the point where the\nmeta block group would start. This must be considered when updating the\nbackup block group descriptors to follow the non-meta_bg layout. The fix\nis to add a test whether the group to add is already part of the meta\nblock group or not."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ext4: corregida la corrupción durante el cambio de tamaño en línea Observamos una corrupción durante el cambio de tamaño en línea de un sistema de archivos de más de 16 TiB con un tamaño de bloque de 4k. Al tener más de 2 ^ 32 bloques, mke2fs desactiva resize_inode de forma predeterminada. El problema se puede reproducir en un sistema de archivos más pequeño por conveniencia desactivando explícitamente resize_inode. Un cambio de tamaño en línea a través de un límite de 8 GiB (el tamaño de un grupo de metabloques en esta configuración) conduce a una corrupción: dev=/dev/ # debería ser &gt;= 16 GiB mkdir -p /corruption /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15)) mount -t ext4 $dev /corruption dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15)) sha1sum /corruption/test # 79d2658b39dcfd77274e435b0934028adafaab11 /corruption/test /sbin/resize2fs $dev $((2*2**21)) # soltar caché de página para forzar la recarga del bloque desde el disco echo 1 &gt; /proc/sys/vm/drop_caches sha1sum /corruption/test # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3 /corruption/test 2^21 = 2^15*2^6 equivale a 8 GiB de los cuales 2^15 es el número de bloques por grupo de bloques y 2^6 es el número de grupos de bloques que forman un metagrupo de bloques. La última suma de comprobación puede ser diferente dependiendo de cómo esté distribuido el archivo en los bloques físicos. La corrupción real ocurre en el bloque físico 63*2^15 = 2064384, que sería la ubicación de la copia de seguridad del descriptor de bloque del grupo de metabloques. Durante el cambio de tamaño en línea, el sistema de archivos se convertirá a meta_bg comenzando en s_first_meta_bg, que en el ejemplo es 2, es decir, todos los grupos de bloques después de 16 GiB. Sin embargo, en ext4_flex_group_add podríamos agregar grupos de bloques que aún no forman parte del primer metagrupo de bloques. En el reproductor logramos esto restando el tamaño de un grupo de bloques completo desde el punto donde comenzaría el grupo de metabloques. Esto debe tenerse en cuenta al actualizar los descriptores del grupo de bloques de respaldo para que sigan el diseño que no es meta_bg. La solución es agregar una prueba de si el grupo a agregar ya forma parte del grupo de metabloques o no."
    }
  ],
  "lastModified": "2026-06-17T07:35:26.657",
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