CVE-2023-6546
highA race condition was found in the GSM 0710 tty multiplexor in the Linux kernel.
Vendor / product: Linux — linux kernel
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.
CVSS
7.0
7.0 (CVSS v3.1)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2023-12-21 20:15
Modified: 2026-11-04 21:17
NVD status: Modified
Last synced 3 hours ago
Verified against the source API 2026-11-04 21:37 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
linux / linux_kernel <6.5, 6.5
fedoraproject / fedora 39
redhat / enterprise_linux 8.0, 9.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=2255498
Patch / mitigation: https://github.com/torvalds/linux/commit/3c4f8333b582487a2d1e02171f1465531cde53e3
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=2255498
References
- https://access.redhat.com/errata/RHSA-2024:0930 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:0937 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1018 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1019 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1055 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1250 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1253 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1306 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1607 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1612 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:1614 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:2093 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:2394 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:2621 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:2697 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:4577 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:4729 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:4731 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2024:4970 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2023-6546 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2255498 secalert@redhat.com
- https://github.com/torvalds/linux/commit/3c4f8333b582487a2d1e02171f1465531cde53e3 secalert@redhat.com
- https://www.zerodayinitiative.com/advisories/ZDI-CAN-20527 secalert@redhat.com
- http://www.openwall.com/lists/oss-security/2024/04/10/18 af854a3a-2127-422b-91ae-364da2661108
- http://www.openwall.com/lists/oss-security/2024/04/10/21 af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-11-04 21:37 UTC · record ↗