{
  "cveId": "CVE-2021-47114",
  "url": "https://patchblox.com/security/cve/CVE-2021-47114",
  "summary": "CVE-2021-47114 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47114, released March 15, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ocfs2: fix data corruption by fallocate  When fa...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ocfs2: fix data corruption by fallocate  When fallocate punches holes out of inode size, if original isize is in the middle of last cluster, then the part from isize to the end of the cluster will be zeroed with buffer write, at that time isize is not yet updated to match the new size, if writeback is kicked in, it will invoke ocfs2_writepage()-\u003Eblock_write_full_page() where the pages out of inode size will be dropped.  That will cause file corruption.  Fix this by zero out eof blocks when extending the inode size.  Running the following command with qemu-image 4.2.1 can get a corrupted coverted image file easily.      qemu-img convert -p -t none -T none -f qcow2 $qcow_image \\              -O qcow2 -o compat=1.1 $qcow_image.conv  The usage of fallocate in qemu is like this, it first punches holes out of inode size, then extend the inode size.      fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0     fallocate(11, 0, 2276196352, 65536) = 0  v1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html v2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/",
  "published": "2024-03-15T21:15:06Z",
  "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": 0.00226,
  "epssPercentile": 0.13383,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47114",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47114",
      "released": "2024-03-15T21:15:06Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47114",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47114",
      "released": "2024-03-15T21:15:06Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47114",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47114",
      "released": "2024-03-15T21:15:06Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}