ghsa-vq28-2hrg-3rf4
Vulnerability from github
Published
2024-09-27 15:30
Modified
2024-10-09 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:

userfaultfd: don't BUG_ON() if khugepaged yanks our page table

Since khugepaged was changed to allow retracting page tables in file mappings without holding the mmap lock, these BUG_ON()s are wrong - get rid of them.

We could also remove the preceding "if (unlikely(...))" block, but then we could reach pte_offset_map_lock() with transhuge pages not just for file mappings but also for anonymous mappings - which would probably be fine but I think is not necessarily expected.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-46838"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-27T13:15:15Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: don\u0027t BUG_ON() if khugepaged yanks our page table\n\nSince khugepaged was changed to allow retracting page tables in file\nmappings without holding the mmap lock, these BUG_ON()s are wrong - get\nrid of them.\n\nWe could also remove the preceding \"if (unlikely(...))\" block, but then we\ncould reach pte_offset_map_lock() with transhuge pages not just for file\nmappings but also for anonymous mappings - which would probably be fine\nbut I think is not necessarily expected.",
  "id": "GHSA-vq28-2hrg-3rf4",
  "modified": "2024-10-09T18:31:40Z",
  "published": "2024-09-27T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-46838"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a594acc12d5954cdc71d4450a386748bf3d136a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db978287e908d48b209e374b00d847b2d785e0a9"
    }
  ],
  "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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