{
  "cveId": "CVE-2021-47117",
  "url": "https://patchblox.com/security/cve/CVE-2021-47117",
  "summary": "CVE-2021-47117 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47117, 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:  ext4: fix bug on in ext4_es_cache_extent as ext4...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed  We got follow bug_on when run fsstress with injecting IO fault: [130747.323114] kernel BUG at fs/ext4/extents_status.c:762! [130747.323117] Internal error: Oops - BUG: 0 [#1] SMP ...... [130747.334329] Call trace: [130747.334553]  ext4_es_cache_extent\u002B0x150/0x168 [ext4] [130747.334975]  ext4_cache_extents\u002B0x64/0xe8 [ext4] [130747.335368]  ext4_find_extent\u002B0x300/0x330 [ext4] [130747.335759]  ext4_ext_map_blocks\u002B0x74/0x1178 [ext4] [130747.336179]  ext4_map_blocks\u002B0x2f4/0x5f0 [ext4] [130747.336567]  ext4_mpage_readpages\u002B0x4a8/0x7a8 [ext4] [130747.336995]  ext4_readpage\u002B0x54/0x100 [ext4] [130747.337359]  generic_file_buffered_read\u002B0x410/0xae8 [130747.337767]  generic_file_read_iter\u002B0x114/0x190 [130747.338152]  ext4_file_read_iter\u002B0x5c/0x140 [ext4] [130747.338556]  __vfs_read\u002B0x11c/0x188 [130747.338851]  vfs_read\u002B0x94/0x150 [130747.339110]  ksys_read\u002B0x74/0xf0  This patch\u0027s modification is according to Jan Kara\u0027s suggestion in: https://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/ \u0022I see. Now I understand your patch. Honestly, seeing how fragile is trying to fix extent tree after split has failed in the middle, I would probably go even further and make sure we fix the tree properly in case of ENOSPC and EDQUOT (those are easily user triggerable).  Anything else indicates a HW problem or fs corruption so I\u0027d rather leave the extent tree as is and don\u0027t try to fix it (which also means we will not create overlapping extents).\u0022",
  "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": 0.00242,
  "epssPercentile": 0.15501,
  "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-2021-47117",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47117",
      "released": "2024-03-15T21:15:06Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47117",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47117",
      "released": "2024-03-15T21:15:06Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47117",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47117",
      "released": "2024-03-15T21:15:06Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}