ghsa-7jh9-v3vw-v9px
Vulnerability from github
Published
2024-10-21 12:30
Modified
2024-10-22 18:32
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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

mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway

Syzbot reports a UAF in hugetlb_fault(). This happens because vmf_anon_prepare() could drop the per-VMA lock and allow the current VMA to be freed before hugetlb_vma_unlock_read() is called.

We can fix this by using a modified version of vmf_anon_prepare() that doesn't release the VMA lock on failure, and then release it ourselves after hugetlb_vma_unlock_read().

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2024-47676"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T12:15:04Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb.c: fix UAF of vma in hugetlb fault pathway\n\nSyzbot reports a UAF in hugetlb_fault().  This happens because\nvmf_anon_prepare() could drop the per-VMA lock and allow the current VMA\nto be freed before hugetlb_vma_unlock_read() is called.\n\nWe can fix this by using a modified version of vmf_anon_prepare() that\ndoesn\u0027t release the VMA lock on failure, and then release it ourselves\nafter hugetlb_vma_unlock_read().",
  "id": "GHSA-7jh9-v3vw-v9px",
  "modified": "2024-10-22T18:32:09Z",
  "published": "2024-10-21T12:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47676"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98b74bb4d7e96b4da5ef3126511febe55b76b807"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d59ebc99dee0a2687a26df94b901eb8216dbf876"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e897d184a8dd4a4e1f39c8c495598e4d9472776c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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