# CVE-2023-6546

## Summary

- **CVE ID:** CVE-2023-6546
- **Severity:** HIGH
- **CVSS Score:** 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-366
- **Published:** Dec 21, 2023
- **Last Modified:** Aug 6, 2026

## 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.

## Affected Products

- Red Hat — Red Hat Enterprise Linux 8 (0:4.18.0-513.24.1.rt7.326.el8_9)
- Red Hat — Red Hat Enterprise Linux 8 (0:4.18.0-513.24.1.el8_9)
- Red Hat — Red Hat Enterprise Linux 8.2 Advanced Update Support (0:4.18.0-193.136.1.el8_2)
- Red Hat — Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (0:4.18.0-305.134.1.el8_4)
- Red Hat — Red Hat Enterprise Linux 8.4 Telecommunications Update Service (0:4.18.0-305.134.1.rt7.210.el8_4)
- Red Hat — Red Hat Enterprise Linux 8.4 Telecommunications Update Service (0:4.18.0-305.134.1.el8_4)
- Red Hat — Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions (0:4.18.0-305.134.1.el8_4)
- Red Hat — Red Hat Enterprise Linux 8.6 Extended Update Support (0:4.18.0-372.93.1.el8_6)
- Red Hat — Red Hat Enterprise Linux 8.8 Extended Update Support (0:4.18.0-477.55.1.el8_8)
- Red Hat — Red Hat Enterprise Linux 9 (0:5.14.0-427.13.1.el9_4)
- Red Hat — Red Hat Enterprise Linux 9.0 Extended Update Support (0:5.14.0-70.93.2.el9_0)
- Red Hat — Red Hat Enterprise Linux 9.0 Extended Update Support (0:5.14.0-70.93.1.rt21.165.el9_0)
- Red Hat — Red Hat Enterprise Linux 9.2 Extended Update Support (0:5.14.0-284.55.1.el9_2)
- Red Hat — Red Hat Enterprise Linux 9.2 Extended Update Support (0:5.14.0-284.55.1.rt14.340.el9_2)
- Red Hat — Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 (0:4.18.0-372.93.1.el8_6)
- Red Hat — RHOL-5.7-RHEL-8 (v5.7.13-16)
- Red Hat — RHOL-5.7-RHEL-8 (v5.7.13-7)
- Red Hat — RHOL-5.7-RHEL-8 (v6.8.1-408)
- Red Hat — RHOL-5.7-RHEL-8 (v5.7.13-19)
- Red Hat — RHOL-5.7-RHEL-8 (v1.0.0-480)
- Red Hat — RHOL-5.7-RHEL-8 (v5.7.13-9)
- Red Hat — RHOL-5.7-RHEL-8 (v0.4.0-248)
- Red Hat — RHOL-5.7-RHEL-8 (v1.14.6-215)
- Red Hat — RHOL-5.7-RHEL-8 (v6.8.1-431)
- Red Hat — RHOL-5.7-RHEL-8 (v1.1.0-228)
- Red Hat — RHOL-5.7-RHEL-8 (v5.8.1-471)
- Red Hat — RHOL-5.7-RHEL-8 (v2.9.6-15)
- Red Hat — RHOL-5.7-RHEL-8 (v5.7.13-3)
- Red Hat — RHOL-5.7-RHEL-8 (v5.7.13-27)
- Red Hat — RHOL-5.7-RHEL-8 (v5.7.13-12)
- Red Hat — RHOL-5.7-RHEL-8 (v0.1.0-527)
- Red Hat — RHOL-5.7-RHEL-8 (v0.1.0-225)
- Red Hat — RHOL-5.7-RHEL-8 (v0.28.1-57)

## References

- [CNA](https://access.redhat.com/errata/RHSA-2024:0930)
- [CNA](https://access.redhat.com/errata/RHSA-2024:0937)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1018)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1019)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1055)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1250)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1253)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1306)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1607)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1612)
- [CNA](https://access.redhat.com/errata/RHSA-2024:1614)
- [CNA](https://access.redhat.com/errata/RHSA-2024:2093)
- [CNA](https://access.redhat.com/errata/RHSA-2024:2394)
- [CNA](https://access.redhat.com/errata/RHSA-2024:2621)
- [CNA](https://access.redhat.com/errata/RHSA-2024:2697)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4577)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4729)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4731)
- [CNA](https://access.redhat.com/errata/RHSA-2024:4970)
- [CNA](https://access.redhat.com/security/cve/CVE-2023-6546)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2255498)
- [CNA](https://github.com/torvalds/linux/commit/3c4f8333b582487a2d1e02171f1465531cde53e3)
- [CNA](https://www.zerodayinitiative.com/advisories/ZDI-CAN-20527)
- [CVE](http://www.openwall.com/lists/oss-security/2024/04/10/18)
- [CVE](http://www.openwall.com/lists/oss-security/2024/04/10/21)
- [CVE](http://www.openwall.com/lists/oss-security/2024/04/11/7)
- [CVE](http://www.openwall.com/lists/oss-security/2024/04/11/9)
- [CVE](http://www.openwall.com/lists/oss-security/2024/04/12/1)
- [CVE](http://www.openwall.com/lists/oss-security/2024/04/12/2)
- [CVE](http://www.openwall.com/lists/oss-security/2024/04/16/2)
- [CVE](http://www.openwall.com/lists/oss-security/2024/04/17/1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 54.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._