nvd-json-data-feeds/CVE-2021/CVE-2021-474xx/CVE-2021-47483.json

{
  "id": "CVE-2021-47483",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-05-22T09:15:10.227",
  "lastModified": "2024-05-22T12:46:53.887",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nregmap: Fix possible double-free in regcache_rbtree_exit()\n\nIn regcache_rbtree_insert_to_block(), when 'present' realloc failed,\nthe 'blk' which is supposed to assign to 'rbnode->block' will be freed,\nso 'rbnode->block' points a freed memory, in the error handling path of\nregcache_rbtree_init(), 'rbnode->block' will be freed again in\nregcache_rbtree_exit(), KASAN will report double-free as follows:\n\nBUG: KASAN: double-free or invalid-free in kfree+0xce/0x390\nCall Trace:\n slab_free_freelist_hook+0x10d/0x240\n kfree+0xce/0x390\n regcache_rbtree_exit+0x15d/0x1a0\n regcache_rbtree_init+0x224/0x2c0\n regcache_init+0x88d/0x1310\n __regmap_init+0x3151/0x4a80\n __devm_regmap_init+0x7d/0x100\n madera_spi_probe+0x10f/0x333 [madera_spi]\n spi_probe+0x183/0x210\n really_probe+0x285/0xc30\n\nTo fix this, moving up the assignment of rbnode->block to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: regmap: corrige posible doble liberaci\u00f3n en regcache_rbtree_exit() En regcache_rbtree_insert_to_block(), cuando la realloc 'presente' fallaba, el 'blk' que se supone debe asignarse a 'rbnode->block ' se liberar\u00e1, por lo que 'rbnode->block' apunta a una memoria liberada, en la ruta de manejo de errores de regcache_rbtree_init(), 'rbnode->block' se liberar\u00e1 nuevamente en regcache_rbtree_exit(), KASAN informar\u00e1 la doble liberaci\u00f3n de la siguiente manera : ERROR: KASAN: doble libre o no v\u00e1lido en kfree+0xce/0x390 Rastreo de llamadas: slab_free_freelist_hook+0x10d/0x240 kfree+0xce/0x390 regcache_rbtree_exit+0x15d/0x1a0 regcache_rbtree_init+0x224/0x2c0 regcache_init+0x88d/ 0x1310 __regmap_init+0x3151/ 0x4a80 __devm_regmap_init+0x7d/0x100 madera_spi_probe+0x10f/0x333 [madera_spi] spi_probe+0x183/0x210 Actually_probe+0x285/0xc30 Para solucionar este problema, mueva hacia arriba la asignaci\u00f3n de rbnode->block inmediatamente despu\u00e9s de que la reasignaci\u00f3n se haya realizado correctamente para que la estructura de datos permanezca v\u00e1lido incluso si la segunda reasignaci\u00f3n falla."
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}