CVE-2023-6546

Kernel: gsm multiplexing race condition leads to privilege escalation

State: Published
Severity: 7.0 High
Published: Dec 21, 2023
Updated: Aug 6, 2026
Reserved: Dec 6, 2023

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.

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-366 Race Condition within a Thread

Affected Products

Product	Versions
Red Hat Enterprise Linux 8Red Hat	0:4.18.0-513.24.1.rt7.326.el8_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:4.18.0-513.24.1.el8_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	0:4.18.0-193.136.1.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:4.18.0-305.134.1.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	0:4.18.0-305.134.1.rt7.210.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	0:4.18.0-305.134.1.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat	0:4.18.0-305.134.1.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat
Red Hat Enterprise Linux 8.6 Extended Update SupportRed Hat	0:4.18.0-372.93.1.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update SupportRed Hat
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	0:4.18.0-477.55.1.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat
Red Hat Enterprise Linux 9Red Hat	0:5.14.0-427.13.1.el9_4 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:5.14.0-427.13.1.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:5.14.0-70.93.2.el9_0 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:5.14.0-70.93.1.rt21.165.el9_0 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	0:5.14.0-284.55.1.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	0:5.14.0-284.55.1.rt14.340.el9_2 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Red Hat	0:4.18.0-372.93.1.el8_6 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v5.7.13-16 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v5.7.13-7 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v6.8.1-408 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v5.7.13-19 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v1.0.0-480 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v5.7.13-9 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v0.4.0-248 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v1.14.6-215 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v6.8.1-431 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v1.1.0-228 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v5.8.1-471 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v2.9.6-15 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v5.7.13-3 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v5.7.13-27 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v5.7.13-12 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v0.1.0-527 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v0.1.0-225 and laterNot affected
RHOL-5.7-RHEL-8Red Hat	v0.28.1-57 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 9Red Hat

References

RHSA-2024:0930vendor-advisory
RHSA-2024:0937vendor-advisory
RHSA-2024:1018vendor-advisory
RHSA-2024:1019vendor-advisory
RHSA-2024:1055vendor-advisory
RHSA-2024:1250vendor-advisory
RHSA-2024:1253vendor-advisory
RHSA-2024:1306vendor-advisory
RHSA-2024:1607vendor-advisory
RHSA-2024:1612vendor-advisory
RHSA-2024:1614vendor-advisory
RHSA-2024:2093vendor-advisory
RHSA-2024:2394vendor-advisory
RHSA-2024:2621vendor-advisory
RHSA-2024:2697vendor-advisory
RHSA-2024:4577vendor-advisory
RHSA-2024:4729vendor-advisory
RHSA-2024:4731vendor-advisory
RHSA-2024:4970vendor-advisory
https://access.redhat.com/security/cve/CVE-2023-6546vdb-entry
RHBZ#2255498issue-tracking
https://github.com/torvalds/linux/commit/3c4f8333b582487a2d1e02171f1465531cde53e3
https://www.zerodayinitiative.com/advisories/ZDI-CAN-20527
http://www.openwall.com/lists/oss-security/2024/04/10/18
http://www.openwall.com/lists/oss-security/2024/04/10/21
http://www.openwall.com/lists/oss-security/2024/04/11/7
http://www.openwall.com/lists/oss-security/2024/04/11/9
http://www.openwall.com/lists/oss-security/2024/04/12/1
http://www.openwall.com/lists/oss-security/2024/04/12/2
http://www.openwall.com/lists/oss-security/2024/04/16/2
http://www.openwall.com/lists/oss-security/2024/04/17/1

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