Linux Kernel up to 6.5.4 scsi lio_target_nacl_info_show buffer overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.5.4. This affects the function lio_target_nacl_info_show of the component scsi. The manipulation leads to buffer overflow. This vulnerability is documented as CVE-2023-53676. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.5.4 and classified as critical. This issue affects the function lio_target_nacl_info_show of the component scsi. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show() The function lio_target_nacl_info_show() uses sprintf() in a loop to print details for every iSCSI connection in a session without checking for the buffer length. With enough iSCSI connections it's possible to overflow the buffer provided by configfs and corrupt the memory. This patch replaces sprintf() with sysfs_emit_at() that checks for buffer boundries.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2023-53676 since 10/07/2025. The exploitation is known 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 03/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 279063 (SUSE SLED15 / SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2025:4422-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.326, 4.19.295, 5.4.257, 5.10.197, 5.15.133, 6.1.55 or 6.5.5 eliminates this vulnerability. Applying the patch df349e84c2cb0dd05d98c8e1189c26ab4b116083/114b44dddea1f8f99576de3c0e6e9059012002fc/2cbe6a88fbdd6e8aeab358eef61472e2de43d6f6/bbe3ff47bf09db8956bc2eeb49d2d514d256ad2a/5353df78c22623b42a71d51226d228a8413097e2/4738bf8b2d3635c2944b81b2a84d97b8c8b0978d/0cac6cbb9908309352a5d30c1876882771d3da50/801f287c93ff95582b0a2d2163f12870a2f076d4 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 (279063), EUVD (EUVD-2025-31973) and CERT Bund (WID-SEC-2025-2229). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• Amazon Linux 2
• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• RESF Rocky Linux
• Open Source Linux Kernel
• IBM QRadar SIEM
• Dell NetWorker

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.14.325
• 4.19.294
• 5.4.256
• 5.10.196
• 5.15.132
• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.1.16
• 6.1.17
• 6.1.18
• 6.1.19
• 6.1.20
• 6.1.21
• 6.1.22
• 6.1.23
• 6.1.24
• 6.1.25
• 6.1.26
• 6.1.27
• 6.1.28
• 6.1.29
• 6.1.30
• 6.1.31
• 6.1.32
• 6.1.33
• 6.1.34
• 6.1.35
• 6.1.36
• 6.1.37
• 6.1.38
• 6.1.39
• 6.1.40
• 6.1.41
• 6.1.42
• 6.1.43
• 6.1.44
• 6.1.45
• 6.1.46
• 6.1.47
• 6.1.48
• 6.1.49
• 6.1.50
• 6.1.51
• 6.1.52
• 6.1.53
• 6.1.54
• 6.5.0
• 6.5.1
• 6.5.2
• 6.5.3
• 6.5.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

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

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 279063
Nessus Name: SUSE SLED15 / SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2025:4422-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.14.326/4.19.295/5.4.257/5.10.197/5.15.133/6.1.55/6.5.5
Patch: df349e84c2cb0dd05d98c8e1189c26ab4b116083/114b44dddea1f8f99576de3c0e6e9059012002fc/2cbe6a88fbdd6e8aeab358eef61472e2de43d6f6/bbe3ff47bf09db8956bc2eeb49d2d514d256ad2a/5353df78c22623b42a71d51226d228a8413097e2/4738bf8b2d3635c2944b81b2a84d97b8c8b0978d/0cac6cbb9908309352a5d30c1876882771d3da50/801f287c93ff95582b0a2d2163f12870a2f076d4

Timelineinfo

10/07/2025 Advisory disclosed
10/07/2025 +0 days CVE reserved
10/07/2025 +0 days VulDB entry created
03/01/2026 +145 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53676 (🔒)
GCVE (CVE): GCVE-0-2023-53676
GCVE (VulDB): GCVE-100-327461
EUVD: 🔒
CERT Bund: WID-SEC-2025-2229 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/07/2025 19:20
Updated: 03/01/2026 13:14
Changes: 10/07/2025 19:20 (59), 11/23/2025 06:01 (7), 12/19/2025 03:01 (2), 12/26/2025 02:15 (1), 02/03/2026 20:58 (11), 02/04/2026 05:47 (1), 03/01/2026 13:14 (1)
Complete: 🔍
Cache ID: 216::103

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Discussion

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