{
  "cveId": "CVE-2021-47004",
  "url": "https://patchblox.com/security/cve/CVE-2021-47004",
  "summary": "CVE-2021-47004 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47004, released February 28, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to avoid touching checkpointed data in...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to avoid touching checkpointed data in get_victim()  In CP disabling mode, there are two issues when using LFS or SSR | AT_SSR mode to select victim:  1. LFS is set to find source section during GC, the victim should have no checkpointed data, since after GC, section could not be set free for reuse.  Previously, we only check valid chpt blocks in current segment rather than section, fix it.  2. SSR | AT_SSR are set to find target segment for writes which can be fully filled by checkpointed and newly written blocks, we should never select such segment, otherwise it can cause panic or data corruption during allocation, potential case is described as below:   a) target segment has \u0027n\u0027 (n \u003C 512) ckpt valid blocks  b) GC migrates \u0027n\u0027 valid blocks to other segment (segment is still     in dirty list)  c) GC migrates \u0027512 - n\u0027 blocks to target segment (segment has \u0027n\u0027     cp_vblocks and \u0027512 - n\u0027 vblocks)  d) If GC selects target segment via {AT,}SSR allocator, however there     is no free space in targe segment.",
  "published": "2024-02-28T09:15:38Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
  "epss": 0.00238,
  "epssPercentile": 0.14949,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-47004",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47004",
      "released": "2024-02-28T09:15:38Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-47004",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47004",
      "released": "2024-02-28T09:15:38Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.38-1",
      "fix": "DEBIAN-CVE-2021-47004",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47004",
      "released": "2024-02-28T09:15:38Z"
    }
  ],
  "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"
  }
}