nvd-json-data-feeds/CVE-2024/CVE-2024-476xx/CVE-2024-47699.json

{
  "id": "CVE-2024-47699",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-10-21T12:15:06.503",
  "lastModified": "2024-11-08T16:15:25.643",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix potential null-ptr-deref in nilfs_btree_insert()\n\nPatch series \"nilfs2: fix potential issues with empty b-tree nodes\".\n\nThis series addresses three potential issues with empty b-tree nodes that\ncan occur with corrupted filesystem images, including one recently\ndiscovered by syzbot.\n\n\nThis patch (of 3):\n\nIf a b-tree is broken on the device, and the b-tree height is greater than\n2 (the level of the root node is greater than 1) even if the number of\nchild nodes of the b-tree root is 0, a NULL pointer dereference occurs in\nnilfs_btree_prepare_insert(), which is called from nilfs_btree_insert().\n\nThis is because, when the number of child nodes of the b-tree root is 0,\nnilfs_btree_do_lookup() does not set the block buffer head in any of\npath[x].bp_bh, leaving it as the initial value of NULL, but if the level\nof the b-tree root node is greater than 1, nilfs_btree_get_nonroot_node(),\nwhich accesses the buffer memory of path[x].bp_bh, is called.\n\nFix this issue by adding a check to nilfs_btree_root_broken(), which\nperforms sanity checks when reading the root node from the device, to\ndetect this inconsistency.\n\nThanks to Lizhi Xu for trying to solve the bug and clarifying the cause\nearly on."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: soluciona una posible desreferencia de puntero nulo en nilfs_btree_insert() Serie de parches \"nilfs2: soluciona posibles problemas con nodos de \u00e1rbol b vac\u00edos\". Esta serie aborda tres posibles problemas con nodos de \u00e1rbol b vac\u00edos que pueden ocurrir con im\u00e1genes de sistema de archivos da\u00f1adas, incluido uno descubierto recientemente por syzbot. Este parche (de 3): Si un \u00e1rbol b est\u00e1 roto en el dispositivo y la altura del \u00e1rbol b es mayor que 2 (el nivel del nodo ra\u00edz es mayor que 1) incluso si el n\u00famero de nodos secundarios de la ra\u00edz del \u00e1rbol b es 0, se produce una desreferencia de puntero NULL en nilfs_btree_prepare_insert(), que se llama desde nilfs_btree_insert(). Esto se debe a que, cuando el n\u00famero de nodos secundarios de la ra\u00edz del \u00e1rbol b es 0, nilfs_btree_do_lookup() no establece el encabezado del b\u00fafer de bloque en ninguno de los path[x].bp_bh, dej\u00e1ndolo como el valor inicial de NULL, pero si el nivel del nodo ra\u00edz del \u00e1rbol b es mayor que 1, se llama a nilfs_btree_get_nonroot_node(), que accede a la memoria del b\u00fafer de path[x].bp_bh. Solucione este problema agregando una verificaci\u00f3n a nilfs_btree_root_broken(), que realiza verificaciones de cordura al leer el nodo ra\u00edz desde el dispositivo, para detectar esta inconsistencia. Gracias a Lizhi Xu por intentar resolver el error y aclarar la causa desde el principio."
    }
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        "type": "Primary",
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          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
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        "impactScore": 3.6
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          "value": "CWE-476"
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