CVE-2023-6546: Fedoraproject Fedora

High severity, CVSS 7.0. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 39 only
• Linux Linux Kernel: before 6.5 (fixed in 6.5); version 6.5 only
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only

Published 2023-12-21. Last modified 2026-08-06.