{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-47638",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47638",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2025-02-26T01:54:11.178Z",
    "updatedAt": "2026-08-05T08:48:43.826Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "ubifs: rename_whiteout: Fix double free for whiteout_ui->data",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: rename_whiteout: Fix double free for whiteout_ui->data\n\n'whiteout_ui->data' will be freed twice if space budget fail for\nrename whiteout operation as following process:\n\nrename_whiteout\n  dev = kmalloc\n  whiteout_ui->data = dev\n  kfree(whiteout_ui->data)  // Free first time\n  iput(whiteout)\n    ubifs_free_inode\n      kfree(ui->data)\t    // Double free!\n\nKASAN reports:\n==================================================================\nBUG: KASAN: double-free or invalid-free in ubifs_free_inode+0x4f/0x70\nCall Trace:\n  kfree+0x117/0x490\n  ubifs_free_inode+0x4f/0x70 [ubifs]\n  i_callback+0x30/0x60\n  rcu_do_batch+0x366/0xac0\n  __do_softirq+0x133/0x57f\n\nAllocated by task 1506:\n  kmem_cache_alloc_trace+0x3c2/0x7a0\n  do_rename+0x9b7/0x1150 [ubifs]\n  ubifs_rename+0x106/0x1f0 [ubifs]\n  do_syscall_64+0x35/0x80\n\nFreed by task 1506:\n  kfree+0x117/0x490\n  do_rename.cold+0x53/0x8a [ubifs]\n  ubifs_rename+0x106/0x1f0 [ubifs]\n  do_syscall_64+0x35/0x80\n\nThe buggy address belongs to the object at ffff88810238bed8 which\nbelongs to the cache kmalloc-8 of size 8\n==================================================================\n\nLet ubifs_free_inode() free 'whiteout_ui->data'. BTW, delete unused\nassignment 'whiteout_ui->data_len = 0', process 'ubifs_evict_inode()\n-> ubifs_jnl_delete_inode() -> ubifs_jnl_write_inode()' doesn't need it\n(because 'inc_nlink(whiteout)' won't be excuted by 'goto out_release',\n and the nlink of whiteout inode is 0).",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8b3c7be16f3f4dfd6e15ac651484e59d3fa36274"
            },
            {
              "version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2b3236ecf96db7af5836e1366ce39ace8ce832fa"
            },
            {
              "version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
              "status": "affected",
              "versionType": "git",
              "lessThan": "14276d38c89a170363e90b6ac0a53c3cf61b87fc"
            },
            {
              "version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a90e2dbe66d2647ff95a0442ad2e86482d977fd8"
            },
            {
              "version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2ad07009c459e56ebdcc089d850d664660fdb742"
            },
            {
              "version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b9a937f096e608b3368c1abc920d4d640ba2c94f"
            },
            {
              "version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6d7a158a7363c1f6604aa47ae1a280a5c65123dd"
            },
            {
              "version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
              "status": "affected",
              "versionType": "git",
              "lessThan": "40a8f0d5e7b3999f096570edab71c345da812e3e"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.9",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.9"
            },
            {
              "version": "4.14.276",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.238",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.189",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.110",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.33",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "5.16.19",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.16.*"
            },
            {
              "version": "5.17.2",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.17.*"
            },
            {
              "version": "5.18",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}