Linux Kernel up to 5.15.110/6.1.27/6.2.14/6.3.1 ext4 ext4_write_inline_data_end buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.15.110/6.1.27/6.2.14/6.3.1. It has been rated as critical. Impacted is the function ext4_write_inline_data_end of the component ext4. This manipulation causes buffer overflow. This vulnerability appears as CVE-2023-53270. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.15.110/6.1.27/6.2.14/6.3.1 and classified as critical. Affected by this vulnerability is the function ext4_write_inline_data_end of the component ext4. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2023-53270 since 09/16/2025. The exploitation appears to be easy. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/11/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265175 (Linux Distros Unpatched Vulnerability : CVE-2023-53270), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.111, 6.1.28, 6.2.15 or 6.3.2 eliminates this vulnerability. Applying the patch 18eb23891aeae3229baf8c7c23b76be3364e1967/d30090eb546d993ea3f3023452540c476ea614a5/3ecea2fee14227712694c8b54ad99d471e61de92/53877ed201baa6b58f7ce9df92664a839113c30e/1dedde690303c05ef732b7c5c8356fdf60a4ade3 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265175) and CERT Bund (WID-SEC-2025-2053). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway
  • F5 F5OS

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265175
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-53270

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.111/6.1.28/6.2.15/6.3.2
Patch: 18eb23891aeae3229baf8c7c23b76be3364e1967/d30090eb546d993ea3f3023452540c476ea614a5/3ecea2fee14227712694c8b54ad99d471e61de92/53877ed201baa6b58f7ce9df92664a839113c30e/1dedde690303c05ef732b7c5c8356fdf60a4ade3

Timelineinfo

09/16/2025 Advisory disclosed
09/16/2025 +0 days CVE reserved
09/16/2025 +0 days VulDB entry created
01/11/2026 +117 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53270 (🔒)
GCVE (CVE): GCVE-0-2023-53270
GCVE (VulDB): GCVE-100-324373
CERT Bund: WID-SEC-2025-2053 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/16/2025 14:05
Updated: 01/11/2026 09:17
Changes: 09/16/2025 14:05 (59), 09/20/2025 14:31 (2), 12/03/2025 20:19 (12), 12/29/2025 09:03 (7), 01/11/2026 09:17 (1)
Complete: 🔍
Cache ID: 216::103

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