CVE-2023-53101 (GCVE-0-2023-53101)

Vulnerability from cvelistv5 – Published: 2025-05-02 15:55 – Updated: 2026-05-11 19:38
VLAI
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < d6c1447e483c05dbcfb3ff77ac04237a82070b8c (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 59eee0cdf8c036f554add97a4da7c06d7a9ff34a (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 0d8a6c9a6415999fee1259ccf1796480c026b7d6 (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 3f00c476da8fe7c4c34ea16abb55d74127120413 (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 01a821aacc64d4b05dafd239dbc9b7856686002f (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 9cb27b1e76f0cc886ac09055bc41c0ab3f205167 (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 9e9a4cc5486356158554f6ad73027d8635a48b34 (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < f5361da1e60d54ec81346aee8e3d8baf1be0b762 (git)
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Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 4.14.310 , ≤ 4.14.* (semver)
Unaffected: 4.19.278 , ≤ 4.19.* (semver)
Unaffected: 5.4.237 , ≤ 5.4.* (semver)
Unaffected: 5.10.175 , ≤ 5.10.* (semver)
Unaffected: 5.15.103 , ≤ 5.15.* (semver)
Unaffected: 6.1.20 , ≤ 6.1.* (semver)
Unaffected: 6.2.7 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: zero i_disksize when initializing the bootloader inode\n\nIf the boot loader inode has never been used before, the\nEXT4_IOC_SWAP_BOOT inode will initialize it, including setting the\ni_size to 0.  However, if the \"never before used\" boot loader has a\nnon-zero i_size, then i_disksize will be non-zero, and the\ninconsistency between i_size and i_disksize can trigger a kernel\nwarning:\n\n WARNING: CPU: 0 PID: 2580 at fs/ext4/file.c:319\n CPU: 0 PID: 2580 Comm: bb Not tainted 6.3.0-rc1-00004-g703695902cfa\n RIP: 0010:ext4_file_write_iter+0xbc7/0xd10\n Call Trace:\n  vfs_write+0x3b1/0x5c0\n  ksys_write+0x77/0x160\n  __x64_sys_write+0x22/0x30\n  do_syscall_64+0x39/0x80\n\nReproducer:\n 1. create corrupted image and mount it:\n       mke2fs -t ext4 /tmp/foo.img 200\n       debugfs -wR \"sif \u003c5\u003e size 25700\" /tmp/foo.img\n       mount -t ext4 /tmp/foo.img /mnt\n       cd /mnt\n       echo 123 \u003e file\n 2. Run the reproducer program:\n       posix_memalign(\u0026buf, 1024, 1024)\n       fd = open(\"file\", O_RDWR | O_DIRECT);\n       ioctl(fd, EXT4_IOC_SWAP_BOOT);\n       write(fd, buf, 1024);\n\nFix this by setting i_disksize as well as i_size to zero when\ninitiaizing the boot loader inode."
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: i_disksize cero al inicializar el inodo del cargador de arranque. Si el inodo del cargador de arranque nunca se ha usado antes, el inodo EXT4_IOC_SWAP_BOOT lo inicializar\u00e1, incluyendo el establecimiento de i_size a 0. Sin embargo, si el cargador de arranque \"nunca usado antes\" tiene un i_size distinto de cero, entonces i_disksize ser\u00e1 distinto de cero, y la inconsistencia entre i_size e i_disksize puede activar una advertencia del kernel: ADVERTENCIA: CPU: 0 PID: 2580 en fs/ext4/file.c:319 CPU: 0 PID: 2580 Comm: bb No contaminado 6.3.0-rc1-00004-g703695902cfa RIP: 0010:ext4_file_write_iter+0xbc7/0xd10 Rastreo de llamadas: vfs_write+0x3b1/0x5c0 ksys_write+0x77/0x160 __x64_sys_write+0x22/0x30 do_syscall_64+0x39/0x80 Reproductor: 1. crear una imagen da\u00f1ada y montarla: mke2fs -t ext4 /tmp/foo.img 200 debugfs -wR \"sif \u0026lt;5\u0026gt; size 25700\" /tmp/foo.img mount -t ext4 /tmp/foo.img /mnt cd /mnt echo 123 \u0026gt; file 2. Ejecutar el programa reproductor: posix_memalign(\u0026amp;buf, 1024, 1024) fd = open(\"file\", O_RDWR | Solucione esto configurando i_disksize e i_size en cero al iniciar el inodo del cargador de arranque."
          }
        ],
        "id": "CVE-2023-53101",
        "lastModified": "2026-06-17T06:44:17.953",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-05-02T16:15:29.023",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/01a821aacc64d4b05dafd239dbc9b7856686002f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0d8a6c9a6415999fee1259ccf1796480c026b7d6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3f00c476da8fe7c4c34ea16abb55d74127120413"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/59eee0cdf8c036f554add97a4da7c06d7a9ff34a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9cb27b1e76f0cc886ac09055bc41c0ab3f205167"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9e9a4cc5486356158554f6ad73027d8635a48b34"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d6c1447e483c05dbcfb3ff77ac04237a82070b8c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f5361da1e60d54ec81346aee8e3d8baf1be0b762"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T22:08:51+00:00",
      "cve": "CVE-2023-53101",
      "id": "CVE-2023-53101",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: zero i_disksize when initializing the bootloader inode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53101.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T16:48:19Z",
      "cve": "CVE-2023-53101",
      "id": "CVE-2023-53101",
      "initial_release_date": "2025-05-03T02:50:41Z",
      "product_status:known_affected": "529",
      "product_status:known_not_affected": "155",
      "product_status:recommended": "251",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53101",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53101.json",
      "version": "41"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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