CVE-2024-57806

{
  "id": "CVE-2024-57806",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "182940f4f4dbd932776414744c8de64333957725",
              "lessThan": "b87c9b9ba05ba6e8e2ee9ecd29a8c930b35648ed",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "182940f4f4dbd932776414744c8de64333957725",
              "lessThan": "f2363e6fcc7938c5f0f6ac066fad0dd247598b51",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/btrfs/qgroup.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.7",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.8",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/btrfs/qgroup.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-01-11T13:15:30.597",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/b87c9b9ba05ba6e8e2ee9ecd29a8c930b35648ed",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f2363e6fcc7938c5f0f6ac066fad0dd247598b51",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix transaction atomicity bug when enabling simple quotas\n\nSet squota incompat bit before committing the transaction that enables\nthe feature.\n\nWith the config CONFIG_BTRFS_ASSERT enabled, an assertion\nfailure occurs regarding the simple quota feature.\n\n  [5.596534] assertion failed: btrfs_fs_incompat(fs_info, SIMPLE_QUOTA), in fs/btrfs/qgroup.c:365\n  [5.597098] ------------[ cut here ]------------\n  [5.597371] kernel BUG at fs/btrfs/qgroup.c:365!\n  [5.597946] CPU: 1 UID: 0 PID: 268 Comm: mount Not tainted 6.13.0-rc2-00031-gf92f4749861b #146\n  [5.598450] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\n  [5.599008] RIP: 0010:btrfs_read_qgroup_config+0x74d/0x7a0\n  [5.604303]  <TASK>\n  [5.605230]  ? btrfs_read_qgroup_config+0x74d/0x7a0\n  [5.605538]  ? exc_invalid_op+0x56/0x70\n  [5.605775]  ? btrfs_read_qgroup_config+0x74d/0x7a0\n  [5.606066]  ? asm_exc_invalid_op+0x1f/0x30\n  [5.606441]  ? btrfs_read_qgroup_config+0x74d/0x7a0\n  [5.606741]  ? btrfs_read_qgroup_config+0x74d/0x7a0\n  [5.607038]  ? try_to_wake_up+0x317/0x760\n  [5.607286]  open_ctree+0xd9c/0x1710\n  [5.607509]  btrfs_get_tree+0x58a/0x7e0\n  [5.608002]  vfs_get_tree+0x2e/0x100\n  [5.608224]  fc_mount+0x16/0x60\n  [5.608420]  btrfs_get_tree+0x2f8/0x7e0\n  [5.608897]  vfs_get_tree+0x2e/0x100\n  [5.609121]  path_mount+0x4c8/0xbc0\n  [5.609538]  __x64_sys_mount+0x10d/0x150\n\nThe issue can be easily reproduced using the following reproducer:\n\n  root@q:linux# cat repro.sh\n  set -e\n\n  mkfs.btrfs -q -f /dev/sdb\n  mount /dev/sdb /mnt/btrfs\n  btrfs quota enable -s /mnt/btrfs\n  umount /mnt/btrfs\n  mount /dev/sdb /mnt/btrfs\n\nThe issue is that when enabling quotas, at btrfs_quota_enable(), we set\nBTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE at fs_info->qgroup_flags and persist\nit in the quota root in the item with the key BTRFS_QGROUP_STATUS_KEY, but\nwe only set the incompat bit BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA after we\ncommit the transaction used to enable simple quotas.\n\nThis means that if after that transaction commit we unmount the filesystem\nwithout starting and committing any other transaction, or we have a power\nfailure, the next time we mount the filesystem we will find the flag\nBTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE set in the item with the key\nBTRFS_QGROUP_STATUS_KEY but we will not find the incompat bit\nBTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA set in the superblock, triggering an\nassertion failure at:\n\n  btrfs_read_qgroup_config() -> qgroup_read_enable_gen()\n\nTo fix this issue, set the BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA flag\nimmediately after setting the BTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE.\nThis ensures that both flags are flushed to disk within the same\ntransaction."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: se corrige el error de atomicidad de transacciones al habilitar cuotas simples. Establezca el bit de incompatibilidad de squota antes de confirmar la transacción que habilita la función. Con la configuración CONFIG_BTRFS_ASSERT habilitada, se produce un error de afirmación con respecto a la función de cuota simple. [5.596534] Error de afirmación: btrfs_fs_incompat(fs_info, SIMPLE_QUOTA), en fs/btrfs/qgroup.c:365 [5.597098] ------------[ corte aquí ]------------ [5.597371] ¡ERROR del kernel en fs/btrfs/qgroup.c:365! [5.597946] CPU: 1 UID: 0 PID: 268 Comm: montaje No contaminado 6.13.0-rc2-00031-gf92f4749861b #146 [5.598450] Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 01/04/2014 [5.599008] RIP: 0010:btrfs_read_qgroup_config+0x74d/0x7a0 [5.604303]  [5.605230] ? btrfs_read_qgroup_config+0x74d/0x7a0 [5.605538] ? asm_exc_invalid_op+0x1f/0x30 [5.606441] ? btrfs_read_qgroup_config+0x74d/0x7a0 [5.606741] ? btrfs_read_qgroup_config+0x74d/0x7a0 [5.607038] ? intentar_activar+0x317/0x760 [5.607286] abrir_ctree+0xd9c/0x1710 [5.607509] btrfs_get_tree+0x58a/0x7e0 [5.608002] vfs_get_tree+0x2e/0x100 [5.608224] montaje_fc+0x16/0x60 [5.608420] btrfs_get_tree+0x2f8/0x7e0 [5.608897] vfs_get_tree+0x2e/0x100 [5.609121] montaje_ruta+0x4c8/0xbc0 [5.609538] __x64_sys_mount+0x10d/0x150 El problema se puede reproducir fácilmente utilizando el siguiente reproductor: root@q:linux# cat repro.sh set -e mkfs.btrfs -q -f /dev/sdb mount /dev/sdb /mnt/btrfs btrfs quota enable -s /mnt/btrfs umount /mnt/btrfs mount /dev/sdb /mnt/btrfs El problema es que al habilitar cuotas, en btrfs_quota_enable(), configuramos BTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE en fs_info-&gt;qgroup_flags y lo persistimos en la raíz de cuotas en el elemento con la clave BTRFS_QGROUP_STATUS_KEY, pero solo configuramos el bit de incompatibilidad BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA después de que confirmamos la transacción utilizada para habilitar la cuota simple. Esto significa que si después de esa confirmación de transacción desmontamos el sistema de archivos sin iniciar y confirmar ninguna otra transacción, o tenemos un corte de energía, la próxima vez que montemos el sistema de archivos encontraremos el indicador BTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE establecido en el elemento con la clave BTRFS_QGROUP_STATUS_KEY pero no encontraremos el bit de incompatibilidad BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA establecido en el superbloque, lo que desencadena un error de aserción en: btrfs_read_qgroup_config() -&gt; qgroup_read_enable_gen() Para solucionar este problema, configure el indicador BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA inmediatamente después de configurar BTRFS_QGROUP_STATUS_FLAG_SIMPLE_MODE. Esto garantiza que ambos indicadores se vacíen en el disco dentro de la misma transacción."
    }
  ],
  "lastModified": "2026-06-17T08:14:04.507",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}