{
  "cveId": "CVE-2024-49964",
  "url": "https://patchblox.com/security/cve/CVE-2024-49964",
  "summary": "CVE-2024-49964 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-49964, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/hugetlb: fix memfd_pin_folios free_huge_pages...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/hugetlb: fix memfd_pin_folios free_huge_pages leak  memfd_pin_folios followed by unpin_folios fails to restore free_huge_pages if the pages were not already faulted in, because the folio refcount for pages created by memfd_alloc_folio never goes to 0.  memfd_pin_folios needs another folio_put to undo the folio_try_get below:  memfd_alloc_folio()   alloc_hugetlb_folio_nodemask()     dequeue_hugetlb_folio_nodemask()       dequeue_hugetlb_folio_node_exact()         folio_ref_unfreeze(folio, 1);    ; adds 1 refcount   folio_try_get()                        ; adds 1 refcount   hugetlb_add_to_page_cache()            ; adds 512 refcount (on x86)  With the fix, after memfd_pin_folios \u002B unpin_folios, the refcount for the (unfaulted) page is 512, which is correct, as the refcount for a faulted unpinned page is 513.",
  "published": "2024-10-21T18:15:17Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00202,
  "epssPercentile": 0.10151,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.11.4-1",
      "fix": "DEBIAN-CVE-2024-49964",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-49964",
      "released": "2024-10-21T18:15:17Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.11.4-1",
      "fix": "DEBIAN-CVE-2024-49964",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-49964",
      "released": "2024-10-21T18:15:17Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}