vulnerability
Red Hat: CVE-2023-6546: kernel: GSM multiplexing race condition leads to privilege escalation (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:L/AC:M/Au:S/C:C/I:C/A:C) | Dec 21, 2023 | Feb 22, 2024 | Mar 27, 2026 |
Severity
7
CVSS
(AV:L/AC:M/Au:S/C:C/I:C/A:C)
Published
Dec 21, 2023
Added
Feb 22, 2024
Modified
Mar 27, 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.
Solutions
redhat-upgrade-kernelredhat-upgrade-kernel-rt
References
Rapid7 Labs
2026 Global Threat Landscape Report
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