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CVE-2023-6546— Kernel: gsm multiplexing race condition leads to privilege escalation

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于GSM 多路复用竞争条件导致权限升级，当两个线程在启用 gsm 行规则的情况下在同一个 tty 文件描述符上执行 GSMIOC_SETCONF ioctl 时，会出现此问题，并且可能会导致在重新启动 gsm mux 时在 struct gsm_dlci 上出现释放后重用问题。

CVSS 7.0 · High EPSS 0.73% · P53

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 44

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.24.1.rt7.326.el8_9< * unaffected
0:4.18.0-513.24.1.el8_9< * unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:4.18.0-193.136.1.el8_2< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:4.18.0-305.134.1.el8_4< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:4.18.0-305.134.1.rt7.210.el8_4< * unaffected
0:4.18.0-305.134.1.el8_4< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions 0:4.18.0-305.134.1.el8_4< * unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:4.18.0-372.93.1.el8_6< * unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:4.18.0-477.55.1.el8_8< * unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-427.13.1.el9_4< * unaffected
0:5.14.0-427.13.1.el9_4< * unaffected
any affected
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:5.14.0-70.93.2.el9_0< * unaffected
0:5.14.0-70.93.1.rt21.165.el9_0< * unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.55.1.el9_2< * unaffected
0:5.14.0-284.55.1.rt14.340.el9_2< * unaffected
any unaffected
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.18.0-372.93.1.el8_6< * unaffected
Red Hat RHOL-5.7-RHEL-8 v5.7.13-16< * unaffected
v5.7.13-7< * unaffected
v6.8.1-408< * unaffected
v5.7.13-19< * unaffected
v1.0.0-480< * unaffected
v5.7.13-9< * unaffected
v0.4.0-248< * unaffected
v1.14.6-215< * unaffected
… +10 more rows
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I. Basic Information for CVE-2023-6546

Vulnerability Information
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Vulnerability Title
Kernel: gsm multiplexing race condition leads to privilege escalation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
单线程内的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于GSM 多路复用竞争条件导致权限升级，当两个线程在启用 gsm 行规则的情况下在同一个 tty 文件描述符上执行 GSMIOC_SETCONF ioctl 时，会出现此问题，并且可能会导致在重新启动 gsm mux 时在 struct gsm_dlci 上出现释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.24.1.rt7.326.el8_9 ~ * cpe:/a:redhat:enterprise_linux:8::nfv
Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.24.1.el8_9 ~ * cpe:/a:redhat:enterprise_linux:8::crb
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:4.18.0-193.136.1.el8_2 ~ * cpe:/o:redhat:rhel_aus:8.2::baseos
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:4.18.0-305.134.1.el8_4 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:4.18.0-305.134.1.rt7.210.el8_4 ~ * cpe:/a:redhat:rhel_tus:8.4::nfv
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service 0:4.18.0-305.134.1.el8_4 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions 0:4.18.0-305.134.1.el8_4 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions - cpe:/o:redhat:rhel_e4s:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:4.18.0-372.93.1.el8_6 ~ * cpe:/a:redhat:rhel_eus:8.6::crb
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support - cpe:/o:redhat:rhel_eus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:4.18.0-477.55.1.el8_8 ~ * cpe:/a:redhat:rhel_eus:8.8::crb
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support - cpe:/o:redhat:rhel_eus:8.8::baseos
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-427.13.1.el9_4 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-427.13.1.el9_4 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:5.14.0-70.93.2.el9_0 ~ * cpe:/a:redhat:rhel_eus:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support 0:5.14.0-70.93.1.rt21.165.el9_0 ~ * cpe:/a:redhat:rhel_eus:9.0::nfv
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support - cpe:/o:redhat:rhel_eus:9.0::baseos
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.55.1.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::appstream
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.55.1.rt14.340.el9_2 ~ * cpe:/a:redhat:rhel_eus:9.2::nfv
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support - cpe:/o:redhat:rhel_eus:9.2::baseos
Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.18.0-372.93.1.el8_6 ~ * cpe:/a:redhat:rhel_eus:8.6::crb
Red Hat RHOL-5.7-RHEL-8 v5.7.13-16 ~ * cpe:/a:redhat:logging:5.7::el8
Red Hat RHOL-5.7-RHEL-8 v5.7.13-7 ~ * cpe:/a:redhat:logging:5.7::el8
Red Hat RHOL-5.7-RHEL-8 v6.8.1-408 ~ * cpe:/a:redhat:logging:5.7::el8
Red Hat RHOL-5.7-RHEL-8 v5.7.13-19 ~ * cpe:/a:redhat:logging:5.7::el8
Red Hat RHOL-5.7-RHEL-8 v1.0.0-480 ~ * cpe:/a:redhat:logging:5.7::el8
Red Hat RHOL-5.7-RHEL-8 v5.7.13-9 ~ * cpe:/a:redhat:logging:5.7::el8
Red Hat RHOL-5.7-RHEL-8 v0.4.0-248 ~ * cpe:/a:redhat:logging:5.7::el8
Red Hat RHOL-5.7-RHEL-8 v1.14.6-215 ~ * cpe:/a:redhat:logging:5.7::el8

II. Public POCs for CVE-2023-6546

# POC Description Source Link Shenlong Link
1 None https://github.com/harithlab/CVE-2023-6546 POC Details
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III. Intelligence Information for CVE-2023-6546

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Patches & Fixes for CVE-2023-6546 (1)

Vendor Advisories for CVE-2023-6546 (19)

Mailing List Discussions for CVE-2023-6546 (8)

Same Patch Batch · Red Hat · 2023-12-21 · 3 CVEs total

CVE-2023-7042 4.4 MEDIUM Kernel: null pointer dereference in ath10k_wmi_tlv_op_pull_mgmt_tx_compl_ev()
CVE-2023-2585 3.5 LOW Keycloak: client access via device auth request spoof

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-366

V. Comments for CVE-2023-6546

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