VDB-248751 · CVE-2023-6546 · EUVD-2023-58776

Linux Kernel up to 6.5-rc6 GSM 0710 TTY Multiplexor drivers/tty/n_gsm.c gsm_error use after free

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.
6.9	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.5-rc6. This affects the function gsm_error of the file drivers/tty/n_gsm.c of the component GSM 0710 TTY Multiplexor. Performing a manipulation results in use after free. This vulnerability is identified as CVE-2023-6546. The attack is only possible with local access. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.5-rc6 (Operating System). This affects the function gsm_error of the file drivers/tty/n_gsm.c of the component GSM 0710 TTY Multiplexor. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 12/21/2023. It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2023-6546 since 12/06/2023. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 209088 (SUSE SLES15 Security Update : kernel (Live Patch 46 for SLE 15 SP2) (SUSE-SU-2024:3642-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.5-rc7 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 3c4f8333b582487a2d1e02171f1465531cde53e3 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (209088) and EUVD (EUVD-2023-58776). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

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: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 7.0
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.0
NVD Vector: 🔍

CNA Base Score: 7.0
CNA Vector (Red Hat, Inc.): 🔍

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: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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: 209088
Nessus Name: SUSE SLES15 Security Update : kernel (Live Patch 46 for SLE 15 SP2) (SUSE-SU-2024:3642-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.5-rc7
Patch: 3c4f8333b582487a2d1e02171f1465531cde53e3

Timelineinfo

12/06/2023 🔍
12/21/2023 +15 days 🔍
12/21/2023 +0 days 🔍
07/26/2025 +583 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 3c4f8333b582487a2d1e02171f1465531cde53e3
Status: Confirmed

CVE: CVE-2023-6546 (🔍)
GCVE (CVE): GCVE-0-2023-6546
GCVE (VulDB): GCVE-100-248751
EUVD: 🔍

Entryinfo

Created: 12/21/2023 17:35
Updated: 07/26/2025 03:50
Changes: 12/21/2023 17:35 (45), 01/14/2024 14:54 (2), 01/14/2024 14:55 (21), 07/08/2024 21:36 (18), 10/16/2024 16:33 (3), 07/26/2025 03:50 (1)
Complete: 🔍
Cache ID: 216::103