CVE-2024-39482 (GCVE-0-2024-39482)

Vulnerability from cvelistv5 – Published: 2024-07-05 06:55 – Updated: 2026-05-12 11:55
VLAI
Title
bcache: fix variable length array abuse in btree_iter
Summary
In the Linux kernel, the following vulnerability has been resolved: bcache: fix variable length array abuse in btree_iter btree_iter is used in two ways: either allocated on the stack with a fixed size MAX_BSETS, or from a mempool with a dynamic size based on the specific cache set. Previously, the struct had a fixed-length array of size MAX_BSETS which was indexed out-of-bounds for the dynamically-sized iterators, which causes UBSAN to complain. This patch uses the same approach as in bcachefs's sort_iter and splits the iterator into a btree_iter with a flexible array member and a btree_iter_stack which embeds a btree_iter as well as a fixed-length data array.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cafe563591446cf80bfbc2fe3bc72a2e36cf1060 , < 2c3d7b03b658dc8bfa6112b194b67b92a87e081b (git)
Affected: cafe563591446cf80bfbc2fe3bc72a2e36cf1060 , < 5a1922adc5798b7ec894cd3f197afb6f9591b023 (git)
Affected: cafe563591446cf80bfbc2fe3bc72a2e36cf1060 , < 934e1e4331859183a861f396d7dfaf33cb5afb02 (git)
Affected: cafe563591446cf80bfbc2fe3bc72a2e36cf1060 , < 6479b9f41583b013041943c4602e1ad61cec8148 (git)
Affected: cafe563591446cf80bfbc2fe3bc72a2e36cf1060 , < 0c31344e22dd8d6b1394c6e4c41d639015bdc671 (git)
Affected: cafe563591446cf80bfbc2fe3bc72a2e36cf1060 , < 3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31 (git)
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Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 5.10.221 , ≤ 5.10.* (semver)
Unaffected: 5.15.162 , ≤ 5.15.* (semver)
Unaffected: 6.1.94 , ≤ 6.1.* (semver)
Unaffected: 6.6.34 , ≤ 6.6.* (semver)
Unaffected: 6.9.5 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.1 (custom)
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Siemens RUGGEDCOM RST2428P Unaffected: 0 , < * (custom)
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Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Unaffected: 0 , < * (custom)
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Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.1 (custom)
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Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Unaffected: 0 , < * (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
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Show details on NVD website
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Modified",
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    "microsoft_vex": {
      "current_release_date": "2026-02-18T01:30:09.000Z",
      "cve": "CVE-2024-39482",
      "id": "msrc_CVE-2024-39482",
      "initial_release_date": "2024-07-01T07:00:00.000Z",
      "product_status:fixed": "5",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bcache: fix variable length array abuse in btree_iter",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-39482.json",
      "version": "13"
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Previously, the struct had a fixed-length array of\\nsize MAX_BSETS which was indexed out-of-bounds for the dynamically-sized\\niterators, which causes UBSAN to complain.\\n\\nThis patch uses the same approach as in bcachefs\u0027s sort_iter and splits\\nthe iterator into a btree_iter with a flexible array member and a\\nbtree_iter_stack which embeds a btree_iter as well as a fixed-length\\ndata array.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bcache: corrige el abuso de matriz de longitud variable en btree_iter btree_iter se usa de dos maneras: ya sea asignado en la pila con un tama\u00f1o fijo MAX_BSETS, o desde un mempool con un tama\u00f1o din\u00e1mico basado en el conjunto de cach\u00e9 espec\u00edfico. Anteriormente, la estructura ten\u00eda una matriz de longitud fija de tama\u00f1o MAX_BSETS que estaba indexada fuera de los l\u00edmites para los iteradores de tama\u00f1o din\u00e1mico, lo que provoca que UBSAN se queje. 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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bcache: fix variable length array abuse in btree_iter",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-39482.json",
      "version": "3"
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      "title": "SUSE CVE CVE-2024-39482",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-39482.json",
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Previously, the struct had a fixed-length array of\\nsize MAX_BSETS which was indexed out-of-bounds for the dynamically-sized\\niterators, which causes UBSAN to complain.\\n\\nThis patch uses the same approach as in bcachefs\u0027s sort_iter and splits\\nthe iterator into a btree_iter with a flexible array member and a\\nbtree_iter_stack which embeds a btree_iter as well as a fixed-length\\ndata array.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.221\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.162\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.94\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.34\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.5\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"3.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:21:24.514Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-39482\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:21:24.514Z\", \"dateReserved\": \"2024-06-25T14:23:23.746Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-05T06:55:10.599Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.