CVE-2023-6546 - CVE House
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Status published High CVE-2023-6546

Kernel: gsm multiplexing race condition leads to privilege escalation

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

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 Update Services for SAP Solutions, Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Enterprise Linux 8.8 Extended Update Support, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Enterprise Linux 9.2 Extended Update Support, Red Hat Virtualization 4 for Red Hat Enterprise Linux 8, RHOL-5.7-RHEL-8, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7
Vulnerable Versions:
0:4.18.0-513.24.1.rt7.326.el8_9, 0:4.18.0-513.24.1.el8_9, 0:4.18.0-193.136.1.el8_2, 0:4.18.0-305.134.1.el8_4, 0:4.18.0-305.134.1.rt7.210.el8_4, 0:4.18.0-372.93.1.el8_6, 0:4.18.0-477.55.1.el8_8, 0:5.14.0-427.13.1.el9_4, 0:5.14.0-70.93.2.el9_0, 0:5.14.0-70.93.1.rt21.165.el9_0, 0:5.14.0-284.55.1.el9_2, 0:5.14.0-284.55.1.rt14.340.el9_2, v5.7.13-16, v5.7.13-7, v6.8.1-408, v5.7.13-19, v1.0.0-480, v5.7.13-9, v0.4.0-248, v1.14.6-215, v6.8.1-431, v1.1.0-228, v5.8.1-471, v2.9.6-15, v5.7.13-3, v5.7.13-27, v5.7.13-12, v0.1.0-527, v0.1.0-225, v0.28.1-57

Timeline

Official Publish: December 21st, 2023
Last Modified: February 18th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-366

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.