CVE-2021-47483 (GCVE-0-2021-47483)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-05-11 13:55
VLAI
Title
regmap: Fix possible double-free in regcache_rbtree_exit()
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3f4ff561bc88b074d5e868dde4012d89cbb06c87 , < e72dce9afbdbfa70d9b44f5908a50ff6c4858999 (git)
Affected: 3f4ff561bc88b074d5e868dde4012d89cbb06c87 , < fc081477b47dfc3a6cb50a96087fc29674013fc2 (git)
Affected: 3f4ff561bc88b074d5e868dde4012d89cbb06c87 , < 758ced2c3878ff789801e6fee808e185c5cf08d6 (git)
Affected: 3f4ff561bc88b074d5e868dde4012d89cbb06c87 , < 3dae1a4eced3ee733d7222e69b8a55caf2d61091 (git)
Affected: 3f4ff561bc88b074d5e868dde4012d89cbb06c87 , < 1cead23c1c0bc766dacb900a3b0269f651ad596f (git)
Affected: 3f4ff561bc88b074d5e868dde4012d89cbb06c87 , < 36e911a16b377bde0ad91a8c679069d0d310b1a6 (git)
Affected: 3f4ff561bc88b074d5e868dde4012d89cbb06c87 , < 50cc1462a668dc62949a1127388bc3af785ce047 (git)
Affected: 3f4ff561bc88b074d5e868dde4012d89cbb06c87 , < 55e6d8037805b3400096d621091dfbf713f97e83 (git)
Create a notification for this product.
Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 4.4.291 , ≤ 4.4.* (semver)
Unaffected: 4.9.289 , ≤ 4.9.* (semver)
Unaffected: 4.14.254 , ≤ 4.14.* (semver)
Unaffected: 4.19.215 , ≤ 4.19.* (semver)
Unaffected: 5.4.157 , ≤ 5.4.* (semver)
Unaffected: 5.10.77 , ≤ 5.10.* (semver)
Unaffected: 5.14.16 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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 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\"https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2\"}, {\"url\": \"https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6\"}, {\"url\": \"https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091\"}, {\"url\": \"https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f\"}, {\"url\": \"https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6\"}, {\"url\": \"https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047\"}, {\"url\": \"https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.291\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.289\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.254\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.215\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.157\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.77\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.16\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"3.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:12:04.209Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47483\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:12:04.209Z\", \"dateReserved\": \"2024-05-22T06:20:56.200Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:34.852Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.