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ext4: fix corruption during on-line resize

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: ext4: fix corruption during on-line resize We observed a corruption during on-line resize of a file system that is larger than 16 TiB with 4k block size. With having more then 2^32 blocks resize_inode is turned off by default by mke2fs. The issue can be reproduced on a smaller file system for convenience by explicitly turning off resize_inode. An on-line resize across an 8 GiB boundary (the size of a meta block group in this setup) then leads to a corruption: dev=/dev/ # should be >= 16 GiB mkdir -p /corruption /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15)) mount -t ext4 $dev /corruption dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15)) sha1sum /corruption/test # 79d2658b39dcfd77274e435b0934028adafaab11 /corruption/test /sbin/resize2fs $dev $((2*2**21)) # drop page cache to force reload the block from disk echo 1 > /proc/sys/vm/drop_caches sha1sum /corruption/test # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3 /corruption/test 2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per block group and 2^6 are the number of block groups that make a meta block group. The last checksum might be different depending on how the file is laid out across the physical blocks. The actual corruption occurs at physical block 63*2^15 = 2064384 which would be the location of the backup of the meta block group's block descriptor. During the on-line resize the file syste

Products
Kernel
Affected versions
Not specified
Fixed versions
4.19.312, 5.10.215, 5.15.154, 5.4.274, 6.1.84, 6.6.24, 6.7.12, 6.8.3
CVEs
CVE-2024-35807
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 14:39 UTC · Revision 1

Source evidence

ext4: fix corruption during on-line resize

core-osv · Original source

Published 17 May 2024, 13:23 UTC

In the Linux kernel, the following vulnerability has been resolved: ext4: fix corruption during on-line resize We observed a corruption during on-line resize of a file system that is larger than 16 TiB with 4k block size. With having more then 2^32 blocks resize_inode is turned off by default by mke2fs. The issue can be reproduced on a smaller file system for convenience by explicitly turning off resize_inode. An on-line resize across an 8 GiB boundary (the size of a meta block group in this setup) then leads to a corruption: dev=/dev/ # should be >= 16 GiB mkdir -p /corruption /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15)) mount -t ext4 $dev /corruption dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15)) sha1sum /corruption/test # 79d2658b39dcfd77274e435b0934028adafaab11 /corruption/test /sbin/resize2fs $dev $((2*2**21)) # drop page cache to force reload the block from disk echo 1 > /proc/sys/vm/drop_caches sha1sum /corruption/test # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3 /corruption/test 2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per block group and 2^6 are the number of block groups that make a meta block group. The last checksum might be different depending on how the file is laid out across the physical blocks. The actual corruption occurs at physical block 63*2^15 = 2064384 which would be the location of the backup of the meta block group's block descriptor. During the on-line resize the file syste

osv:CVE-2024-35807

Kernel

Fixed versions: 4.19.312, 5.4.274, 5.10.215, 5.15.154, 6.1.84, 6.6.24, 6.7.12, 6.8.3

Complete source record
{
  "id": "65831ead14936535f4170946249aaf4f53d07cdf4e8bccff37ab4ea913eaed17",
  "url": "https://osv.dev/vulnerability/CVE-2024-35807",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ext4: fix corruption during on-line resize",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ext4: fix corruption during on-line resize We observed a corruption during on-line resize of a file system that is larger than 16 TiB with 4k block size. With having more then 2^32 blocks resize_inode is turned off by default by mke2fs. The issue can be reproduced on a smaller file system for convenience by explicitly turning off resize_inode. An on-line resize across an 8 GiB boundary (the size of a meta block group in this setup) then leads to a corruption: dev=/dev/ # should be >= 16 GiB mkdir -p /corruption /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15)) mount -t ext4 $dev /corruption dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15)) sha1sum /corruption/test # 79d2658b39dcfd77274e435b0934028adafaab11 /corruption/test /sbin/resize2fs $dev $((2*2**21)) # drop page cache to force reload the block from disk echo 1 > /proc/sys/vm/drop_caches sha1sum /corruption/test # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3 /corruption/test 2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per block group and 2^6 are the number of block groups that make a meta block group. The last checksum might be different depending on how the file is laid out across the physical blocks. The actual corruption occurs at physical block 63*2^15 = 2064384 which would be the location of the backup of the meta block group's block descriptor. During the on-line resize the file syste",
    "evidence": "osv:CVE-2024-35807",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "4.19.312",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.274",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.215",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.154",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.84",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.24",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.7.12",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.8.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-35807",
      "aliases": [
        "CVE-2024-35807"
      ],
      "affected": [
        {
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                {
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                {
                  "fixed": "a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-35807.json"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                  "introduced": "3.7.0"
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                  "introduced": "5.11.0"
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            },
            {
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-35807.json"
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        }
      ],
      "modified": "2026-10-28T02:30:51.308532386Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
        "https://git.kernel.org/stable/c/239c669edb2bffa1aa2612519b1d438ab35d6be6",
        "https://git.kernel.org/stable/c/37b6a3ba793bbbae057f5b991970ebcc52cb3db5",
        "https://git.kernel.org/stable/c/722d2c01b8b108f8283d1b7222209d5b2a5aa7bd",
        "https://git.kernel.org/stable/c/75cc31c2e7193b69f5d25650bda5bb42ed92f8a1",
        "https://git.kernel.org/stable/c/a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc",
        "https://git.kernel.org/stable/c/b461910af8ba3bed80f48c2bf852686d05c6fc5c",
        "https://git.kernel.org/stable/c/e8e8b197317228b5089ed9e7802dadf3ccaa027a",
        "https://git.kernel.org/stable/c/ee4e9c1976147a850f6085a13fca95bcaa00d84c",
        "https://git.kernel.org/stable/c/fb1088d51bbaa0faec5a55d4f5818a9ab79e24df",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35807.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-35807",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35807.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-35807",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 519660,
  "published_at": "2024-05-17T13:23:14.869+00:00"
}