CVE-2023-6546

What it is

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.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-12-21 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-04 21:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.7% in the next 30 days (EPSS).
• Severity: 7.0 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-12-21 20:15 UTC

Last modified

2026-11-04 21:17 UTC

Exploit probability

0.7% · EPSS, next 30 days

Weakness

CWE-366

Record status

Modified

Affected

• Linux Kernel < 6.5
• Linux Kernel 6.5
• Fedoraproject Fedora 39
• Redhat Enterprise Linux 8.0
• Redhat Enterprise Linux 9.0

Attack profile CVSS 3.1 · 7.0

Attack vector

Local

Complexity

High

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-6546.md and follow it. Check whether this project is affected by CVE-2023-6546. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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