CVE-2023-53270 (GCVE-0-2023-53270)

Vulnerability from cvelistv5 – Published: 2025-09-16 08:06 – Updated: 2026-01-14 18:12
VLAI?
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.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 64769240bd07f446f83660bb143bb609d8ab4910 , < 18eb23891aeae3229baf8c7c23b76be3364e1967 (git)
Affected: 64769240bd07f446f83660bb143bb609d8ab4910 , < d30090eb546d993ea3f3023452540c476ea614a5 (git)
Affected: 64769240bd07f446f83660bb143bb609d8ab4910 , < 3ecea2fee14227712694c8b54ad99d471e61de92 (git)
Affected: 64769240bd07f446f83660bb143bb609d8ab4910 , < 53877ed201baa6b58f7ce9df92664a839113c30e (git)
Affected: 64769240bd07f446f83660bb143bb609d8ab4910 , < 1dedde690303c05ef732b7c5c8356fdf60a4ade3 (git)
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    Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.15.111 , ≤ 5.15.* (semver)
Unaffected: 6.1.28 , ≤ 6.1.* (semver)
Unaffected: 6.2.15 , ≤ 6.2.* (semver)
Unaffected: 6.3.2 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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i_size, triggering a warning.\\n\\ngeneric_perform_write\\n copied = iov_iter_copy_from_user_atomic(len) // copied \u003c len\\n ext4_da_write_end\\n | ext4_update_i_disksize\\n |  new_i_size = pos + copied;\\n |  WRITE_ONCE(EXT4_I(inode)-\u003ei_disksize, newsize) // update i_disksize\\n | generic_write_end\\n |  copied = block_write_end(copied, len) // copied = 0\\n |   if (unlikely(copied \u003c len))\\n |    if (!PageUptodate(page))\\n |     copied = 0;\\n |  if (pos + copied \u003e inode-\u003ei_size) // return false\\n if (unlikely(copied == 0))\\n  goto again;\\n if (unlikely(iov_iter_fault_in_readable(i, bytes))) {\\n  status = -EFAULT;\\n  break;\\n }\\n\\nWe get i_disksize greater than i_size here, which could trigger WARNING\\ncheck \u0027i_size_read(inode) \u003c EXT4_I(inode)-\u003ei_disksize\u0027 while doing dio:\\n\\next4_dio_write_iter\\n iomap_dio_rw\\n  __iomap_dio_rw // return err, length is not aligned to 512\\n ext4_handle_inode_extension\\n  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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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