ext4: fix i_disksize exceeding i_size problem in paritally written case

{
  "id": "0a8a2e0d5ec4a2f96c673a3f7d3cbec8f948a6a5ecad1f4d3feb926b0452ffc5",
  "url": "https://osv.dev/vulnerability/CVE-2023-53270",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ext4: fix i_disksize exceeding i_size problem in paritally written case",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ext4: fix i_disksize exceeding i_size problem in paritally written case It is possible for i_disksize can exceed i_size, triggering a warning. generic_perform_write copied = iov_iter_copy_from_user_atomic(len) // copied < len ext4_da_write_end | ext4_update_i_disksize | new_i_size = pos + copied; | WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize) // update i_disksize | generic_write_end | copied = block_write_end(copied, len) // copied = 0 | if (unlikely(copied < len)) | if (!PageUptodate(page)) | copied = 0; | if (pos + copied > inode->i_size) // return false if (unlikely(copied == 0)) goto again; if (unlikely(iov_iter_fault_in_readable(i, bytes))) { status = -EFAULT; break; } We get i_disksize greater than i_size here, which could trigger WARNING check 'i_size_read(inode) < EXT4_I(inode)->i_disksize' while doing dio: ext4_dio_write_iter iomap_dio_rw __iomap_dio_rw // return err, length is not aligned to 512 ext4_handle_inode_extension WARN_ON_ONCE(i_size_read(inode) < EXT4_I(inode)->i_disksize) // Oops WARNING: CPU: 2 PID: 2609 at fs/ext4/file.c:319 CPU: 2 PID: 2609 Comm: aa Not tainted 6.3.0-rc2 RIP: 0010:ext4_file_write_iter+0xbc7 Call Trace: vfs_write+0x3b1 ksys_write+0x77 do_syscall_64+0x39 Fix it by updating 'copied' value before updating i_disksize just like ext4_write_inline_data_end() does. A reproducer can be found in the buganizer link below.",
    "evidence": "osv:CVE-2023-53270",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.28",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.15",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.3.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-53270",
      "aliases": [
        "CVE-2023-53270"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "64769240bd07f446f83660bb143bb609d8ab4910"
                },
                {
                  "fixed": "18eb23891aeae3229baf8c7c23b76be3364e1967"
                },
                {
                  "fixed": "d30090eb546d993ea3f3023452540c476ea614a5"
                },
                {
                  "fixed": "3ecea2fee14227712694c8b54ad99d471e61de92"
                },
                {
                  "fixed": "53877ed201baa6b58f7ce9df92664a839113c30e"
                },
                {
                  "fixed": "1dedde690303c05ef732b7c5c8356fdf60a4ade3"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53270.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.27"
                },
                {
                  "fixed": "5.15.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.28"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.15"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.3.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53270.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.388157330Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/18eb23891aeae3229baf8c7c23b76be3364e1967",
        "https://git.kernel.org/stable/c/1dedde690303c05ef732b7c5c8356fdf60a4ade3",
        "https://git.kernel.org/stable/c/3ecea2fee14227712694c8b54ad99d471e61de92",
        "https://git.kernel.org/stable/c/53877ed201baa6b58f7ce9df92664a839113c30e",
        "https://git.kernel.org/stable/c/d30090eb546d993ea3f3023452540c476ea614a5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53270.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53270",
        "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-2023-53270.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53270",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492700,
  "published_at": "2025-09-16T08:06:59.73+00:00"
}