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CVE-2023-6546

HighPublished

Kernel: gsm multiplexing race condition leads to privilege escalation

Published: Dec 21, 2023
Updated: Aug 6, 2026
Assigning CNA: redhat
Evidence observed: Aug 8, 2026

Primary CVSS

7.0/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 52.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2023-6546PoC
C-based exploit for CVE-2023-6546, providing proof-of-concept code to demonstrate and test the vulnerability in affected systems.

Responsible use

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