{
  "cveId": "CVE-2024-42234",
  "url": "https://patchblox.com/security/cve/CVE-2024-42234",
  "summary": "CVE-2024-42234 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-42234, released August 7, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm: fix crashes from deferred split racing folio...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm: fix crashes from deferred split racing folio migration  Even on 6.10-rc6, I\u0027ve been seeing elusive \u0022Bad page state\u0022s (often on flags when freeing, yet the flags shown are not bad: PG_locked had been set and cleared??), and VM_BUG_ON_PAGE(page_ref_count(page) == 0)s from deferred_split_scan()\u0027s folio_put(), and a variety of other BUG and WARN symptoms implying double free by deferred split and large folio migration.  6.7 commit 9bcef5973e31 (\u0022mm: memcg: fix split queue list crash when large folio migration\u0022) was right to fix the memcg-dependent locking broken in 85ce2c517ade (\u0022memcontrol: only transfer the memcg data for migration\u0022), but missed a subtlety of deferred_split_scan(): it moves folios to its own local list to work on them without split_queue_lock, during which time folio-\u003E_deferred_list is not empty, but even the \u0022right\u0022 lock does nothing to secure the folio and the list it is on.  Fortunately, deferred_split_scan() is careful to use folio_try_get(): so folio_migrate_mapping() can avoid the race by folio_undo_large_rmappable() while the old folio\u0027s reference count is temporarily frozen to 0 - adding such a freeze in the !mapping case too (originally, folio lock and unmapping and no swap cache left an anon folio unreachable, so no freezing was needed there: but the deferred split queue offers a way to reach it).",
  "published": "2024-08-07T16:15:46Z",
  "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": 0.00194,
  "epssPercentile": 0.09133,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.9.10-1",
      "fix": "DEBIAN-CVE-2024-42234",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-42234",
      "released": "2024-08-07T16:15:46Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.9.10-1",
      "fix": "DEBIAN-CVE-2024-42234",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-42234",
      "released": "2024-08-07T16:15:46Z"
    }
  ],
  "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"
  }
}