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🛡️ CVE-2023-53270 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ext4: fix i_disksize exceeding i_size problem in paritally written case

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2023-53270 is recorded against 2 packages.

  • kernel (from 6.3.0 up to 6.3.2)
  • linux-kernel (from 6.3 up to 6.3.2)

Timeline and source

Published on 16 September 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2023-53270 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-09-16
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.3.0 6.3.2
linux-kernel 6.3 6.3.2

Similar Threats

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