Linux Kernel gsm tty multiplexer race leads to local privilege escalation
CVE-2023-6546 Published on December 21, 2023

A race condition was found in the GSM 0710 tty multiplexor in the Linux kernel. This issue occurs when two threads execute the GSMIOC_SETCONF ioctl on the same tty file descriptor with the gsm line discipline enabled, and can lead to a use-after-free problem on a struct gsm_dlci while restarting the gsm mux. This could allow a local unprivileged user to escalate their privileges on the system.

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Vulnerability Analysis

CVE-2023-6546 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
LOCAL
Attack Complexity:
HIGH
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Dangling pointer Vulnerability?

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

CVE-2023-6546 has been classified to as a Dangling pointer vulnerability or weakness.


Products Associated with CVE-2023-6546

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-6546 are published in these products:

Linux Kernel
 
Fedora Project Fedora
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Rhel Aus
 
Red Hat Rhel Tus
 
Red Hat Rhel E4s
 
Red Hat Rhev Hypervisor
 
Red Hat Rhel Eus
 
Red Hat Logging
 
Linux Kernel
 

Affected Versions

Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8.2 Advanced Update Support: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: Red Hat Enterprise Linux 8.4 Telecommunications Update Service: Red Hat Enterprise Linux 8.4 Telecommunications Update Service: Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions: Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions: Red Hat Enterprise Linux 8.6 Extended Update Support: Red Hat Enterprise Linux 8.6 Extended Update Support: Red Hat Enterprise Linux 8.8 Extended Update Support: Red Hat Enterprise Linux 8.8 Extended Update Support: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9.0 Extended Update Support: Red Hat Enterprise Linux 9.0 Extended Update Support: Red Hat Enterprise Linux 9.0 Extended Update Support: Red Hat Enterprise Linux 9.2 Extended Update Support: Red Hat Enterprise Linux 9.2 Extended Update Support: Red Hat Enterprise Linux 9.2 Extended Update Support: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat RHOL-5.7-RHEL-8: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 9:

Exploit Probability

EPSS
0.34%
Percentile
55.99%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.