GHSA-R4V9-V8C5-298P

Vulnerability from github – Published: 2024-10-09 15:32 – Updated: 2025-11-04 00:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()

If we need to increase the tree depth, allocate a new node, and then race with another thread that increased the tree depth before us, we'll still have a preallocated node that might be used later.

If we then use that node for a new non-root node, it'll still have a pointer to the old root instead of being zeroed - fix this by zeroing it in the cmpxchg failure path.

Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2024-47668"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-09T15:15:15Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()\n\nIf we need to increase the tree depth, allocate a new node, and then\nrace with another thread that increased the tree depth before us, we\u0027ll\nstill have a preallocated node that might be used later.\n\nIf we then use that node for a new non-root node, it\u0027ll still have a\npointer to the old root instead of being zeroed - fix this by zeroing it\nin the cmpxchg failure path.",
  "id": "GHSA-r4v9-v8c5-298p",
  "modified": "2025-11-04T00:31:33Z",
  "published": "2024-10-09T15:32:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47668"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f078f8ca93b28a34e20bd050f12cd4efeee7c0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f27f4f445390cb7f73d4209cb2bf32834dc53da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99418ec776a39609f50934720419e0b464ca2283"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad5ee9feebc2eb8cfc76ed74a2d6e55343b0e169"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2f11c6f3e1fc60742673b8675c95b78447f3dae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d942e855324a60107025c116245095632476613e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebeff038744c498a036e7a92eb8e433ae0a386d7"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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