UnratedFix available

ext4: zero i_disksize when initializing the bootloader inode

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: ext4: zero i_disksize when initializing the bootloader inode If the boot loader inode has never been used before, the EXT4_IOC_SWAP_BOOT inode will initialize it, including setting the i_size to 0. However, if the "never before used" boot loader has a non-zero i_size, then i_disksize will be non-zero, and the inconsistency between i_size and i_disksize can trigger a kernel warning: WARNING: CPU: 0 PID: 2580 at fs/ext4/file.c:319 CPU: 0 PID: 2580 Comm: bb Not tainted 6.3.0-rc1-00004-g703695902cfa RIP: 0010:ext4_file_write_iter+0xbc7/0xd10 Call Trace: vfs_write+0x3b1/0x5c0 ksys_write+0x77/0x160 __x64_sys_write+0x22/0x30 do_syscall_64+0x39/0x80 Reproducer: 1. create corrupted image and mount it: mke2fs -t ext4 /tmp/foo.img 200 debugfs -wR "sif <5> size 25700" /tmp/foo.img mount -t ext4 /tmp/foo.img /mnt cd /mnt echo 123 > file 2. Run the reproducer program: posix_memalign(&buf, 1024, 1024) fd = open("file", O_RDWR | O_DIRECT); ioctl(fd, EXT4_IOC_SWAP_BOOT); write(fd, buf, 1024); Fix this by setting i_disksize as well as i_size to zero when initiaizing the boot loader inode.

Products: Kernel
Affected versions: Not specified
Fixed versions: 4.14.310, 4.19.278, 5.10.175, 5.15.103, 5.4.237, 6.1.20, 6.2.7
CVEs: CVE-2023-53101
Confirmed fixed CVEs: Not specified
Updated in this feed: 3 Nov 2026, 05:30 UTC · Revision 1

Source evidence

ext4: zero i_disksize when initializing the bootloader inode

core-osv · Original source

Published 2 May 2025, 15:55 UTC

osv:CVE-2023-53101

Kernel

Fixed versions: 4.14.310, 4.19.278, 5.4.237, 5.10.175, 5.15.103, 6.1.20, 6.2.7

Complete source record

{
  "id": "8f15930637bd74507af3bffb3f9778f3fa74e91966f28e2050ed78283f35e34a",
  "url": "https://osv.dev/vulnerability/CVE-2023-53101",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ext4: zero i_disksize when initializing the bootloader inode",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ext4: zero i_disksize when initializing the bootloader inode If the boot loader inode has never been used before, the EXT4_IOC_SWAP_BOOT inode will initialize it, including setting the i_size to 0. However, if the \"never before used\" boot loader has a non-zero i_size, then i_disksize will be non-zero, and the inconsistency between i_size and i_disksize can trigger a kernel warning: WARNING: CPU: 0 PID: 2580 at fs/ext4/file.c:319 CPU: 0 PID: 2580 Comm: bb Not tainted 6.3.0-rc1-00004-g703695902cfa RIP: 0010:ext4_file_write_iter+0xbc7/0xd10 Call Trace: vfs_write+0x3b1/0x5c0 ksys_write+0x77/0x160 __x64_sys_write+0x22/0x30 do_syscall_64+0x39/0x80 Reproducer: 1. create corrupted image and mount it: mke2fs -t ext4 /tmp/foo.img 200 debugfs -wR \"sif <5> size 25700\" /tmp/foo.img mount -t ext4 /tmp/foo.img /mnt cd /mnt echo 123 > file 2. Run the reproducer program: posix_memalign(&buf, 1024, 1024) fd = open(\"file\", O_RDWR | O_DIRECT); ioctl(fd, EXT4_IOC_SWAP_BOOT); write(fd, buf, 1024); Fix this by setting i_disksize as well as i_size to zero when initiaizing the boot loader inode.",
    "evidence": "osv:CVE-2023-53101",
    "products": [
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        "fixed_versions": [
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "affected": [
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                {
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                  "introduced": "3.10.0"
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      ],
      "modified": "2026-10-28T02:30:26.143040928Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/01a821aacc64d4b05dafd239dbc9b7856686002f",
        "https://git.kernel.org/stable/c/0d8a6c9a6415999fee1259ccf1796480c026b7d6",
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        "https://git.kernel.org/stable/c/9cb27b1e76f0cc886ac09055bc41c0ab3f205167",
        "https://git.kernel.org/stable/c/9e9a4cc5486356158554f6ad73027d8635a48b34",
        "https://git.kernel.org/stable/c/d6c1447e483c05dbcfb3ff77ac04237a82070b8c",
        "https://git.kernel.org/stable/c/f5361da1e60d54ec81346aee8e3d8baf1be0b762",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53101.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53101",
        "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/2023/53xxx/CVE-2023-53101.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53101",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492731,
  "published_at": "2025-05-02T15:55:43.804+00:00"
}