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CVE-2023-6546 is a race condition in the Linux kernel GSM 0710 TTY multiplexer. When the GSM line discipline is enabled, two threads issuing the GSMIOC_SETCONF ioctl concurrently on the same TTY file descriptor can race while restarting the GSM multiplexer. The race can cause a use-after-free of a struct gsm_dlci object, creating a condition that a local low-privileged user may exploit for privilege escalation.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a local privilege escalation exploit for CVE-2023-6546, targeting a race condition in the n_gsm TTY line discipline in the Linux kernel. The exploit is implemented in a single C file ('exploit.c') and is designed to work on Ubuntu 18.04/20.04, CentOS 8, and RHEL 8 systems with the n_gsm kernel module loaded. The exploit works by orchestrating a complex race condition to achieve a use-after-free (UAF) on a kernel structure, which is then exploited to execute arbitrary code in kernel context. The payload sets the setuid bit on /usr/bin/python3, allowing the attacker to spawn a root shell. The exploit is operational and includes hardcoded payload logic, but is not part of a framework. The only other file is a minimal README. The exploit must be run locally on the target system and does not require network access.
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A local privilege escalation vulnerability in the Linux kernel's GSM 0710 tty multiplexor caused by a race condition when two threads execute GSMIOC_SETCONF on the same tty file descriptor with the gsm line discipline enabled.
Linux kernel GSM multiplexing race condition that can lead to privilege escalation.
A race condition in Linux kernel GSM multiplexing that can lead to privilege escalation.
Linux kernel GSM multiplexing race condition that can lead to privilege escalation.
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Cross-references every affected SKU, including bundled OEM variants.
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