fkie_cve-2021-47483
Vulnerability from fkie_nvd
Published
2024-05-22 09:15
Modified
2025-01-06 19:52
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: regmap: Fix possible double-free in regcache_rbtree_exit() In regcache_rbtree_insert_to_block(), when 'present' realloc failed, the 'blk' which is supposed to assign to 'rbnode->block' will be freed, so 'rbnode->block' points a freed memory, in the error handling path of regcache_rbtree_init(), 'rbnode->block' will be freed again in regcache_rbtree_exit(), KASAN will report double-free as follows: BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390 Call Trace: 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 really_probe+0x285/0xc30 To fix this, moving up the assignment of rbnode->block to immediately after the reallocation has succeeded so that the data structure stays valid even if the second reallocation fails.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15


To clipboard 

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  "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 \u0027present\u0027 realloc failed,\nthe \u0027blk\u0027 which is supposed to assign to \u0027rbnode-\u003eblock\u0027 will be freed,\nso \u0027rbnode-\u003eblock\u0027 points a freed memory, in the error handling path of\nregcache_rbtree_init(), \u0027rbnode-\u003eblock\u0027 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-\u003eblock 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 \u0027presente\u0027 fallaba, el \u0027blk\u0027 que se supone debe asignarse a \u0027rbnode-\u0026gt;block \u0027 se liberar\u00e1, por lo que \u0027rbnode-\u0026gt;block\u0027 apunta a una memoria liberada, en la ruta de manejo de errores de regcache_rbtree_init(), \u0027rbnode-\u0026gt;block\u0027 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-\u0026gt;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."
    }
  ],
  "id": "CVE-2021-47483",
  "lastModified": "2025-01-06T19:52:33.037",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-05-22T09:15:10.227",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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