ghsa-rp28-w34f-g6rm
Vulnerability from github
Published
2024-07-05 09:33
Modified
2024-07-08 18:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-39482"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-05T07:15:10Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: fix variable length array abuse in btree_iter\n\nbtree_iter is used in two ways: either allocated on the stack with a\nfixed size MAX_BSETS, or from a mempool with a dynamic size based on the\nspecific cache set. 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.",
  "id": "GHSA-rp28-w34f-g6rm",
  "modified": "2024-07-08T18:31:16Z",
  "published": "2024-07-05T09:33:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-39482"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c31344e22dd8d6b1394c6e4c41d639015bdc671"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c3d7b03b658dc8bfa6112b194b67b92a87e081b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a861560ccb35f2a4f0a4b8207fa7c2a35fc7f31"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a1922adc5798b7ec894cd3f197afb6f9591b023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6479b9f41583b013041943c4602e1ad61cec8148"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/934e1e4331859183a861f396d7dfaf33cb5afb02"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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