CVE-2023-6546
Kernel: gsm multiplexing race condition leads to privilege escalation
HIGH 7.0EPSS 0.7%
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
- Red Hat · 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
- CVSS v3.1 NVD
- 7.0 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.73% chance of exploitation in the next 30 days, 54th percentile
- Published
- 2023-12-21
- Updated
- 2026-08-06
Proof-of-concept exploits (3)
- Nassim-Asrir/ZDI-24-020128★ · 2024-11-12
- harithlab/CVE-2023-65461★ · 2025-02-01
- zerozenxlabs/ZDI-24-020128★ · 2024-11-12
Security advisories
- https://access.redhat.com/security/cve/CVE-2023-6546
- https://bugzilla.redhat.com/show_bug.cgi?id=2255498
- torvalds/linux/commit/3c4f8333b582487a2d1e02171f1465531cde53e3