CVE-2023-6546 HIGH

CVE-2023-6546: Kernel: gsm multiplexing race condition leads to privilege escalation

Vendor Red Hat
Product Red Hat Enterprise Linux 8
Weakness CWE-366
Published December 21, 2023
Last update February 18, 2026
View on NVD All CVEs

CVSS base score

7.0/10
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 21, 2023 CVE published
February 18, 2026 Record updated