CVE-2023-6546 Kernel: gsm multiplexing race condition leads to privilege escalation
High 7.0
Published
Updated
Check this codebase for CVE-2023-6546 and fix it if it is affected.
What it is: CVE-2023-6546 is a high-severity vulnerability in Fedoraproject Fedora, published on 21 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-6546 in the wild and no public exploit code.
Affected product: Fedoraproject Fedora. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2023-6546/ (Markdown: https://insights.sbomify.com/CVE-2023-6546/index.md)
A race condition in the Linux kernel GSM multiplexor allows local unprivileged users to escalate privileges via a use-after-free vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-6546?
CVE-2023-6546 is a high-severity vulnerability in Fedoraproject Fedora, published on 21 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2023-6546?
It affects 3 products.
Linux distribution packages (40)
kpatch-patch-4_18_0-513_11_1 Red Hat:enterprise_linux:8::baseos | All versions | 0:1-2.el8_9 |
kpatch-patch-4_18_0-513_11_1-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1-2.el8_9 |
kpatch-patch-4_18_0-513_11_1-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:1-2.el8_9 |
kpatch-patch-4_18_0-513_5_1 Red Hat:enterprise_linux:8::baseos | All versions | 0:1-4.el8_9 |
kpatch-patch-4_18_0-513_5_1-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1-4.el8_9 |
kpatch-patch-4_18_0-513_5_1-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:1-4.el8_9 |
kpatch-patch-4_18_0-513_9_1 Red Hat:enterprise_linux:8::baseos | All versions | 0:1-3.el8_9 |
kpatch-patch-4_18_0-513_9_1-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1-3.el8_9 |
kpatch-patch-4_18_0-513_9_1-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:1-3.el8_9 |
bpftool Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
bpftool-debuginfo Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-abi-whitelists Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-core Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-debug Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-debug-core Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-debug-debuginfo Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-debug-devel Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-debug-modules Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-debug-modules-extra Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-debuginfo Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-debuginfo-common-x86_64 Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-devel Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-doc Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-modules Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-modules-extra Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-tools Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-tools-debuginfo Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kernel-tools-libs Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
perf Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
perf-debuginfo Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
python3-perf Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
python3-perf-debuginfo Red Hat:rhel_aus:8.2::baseos | All versions | 0:4.18.0-193.136.1.el8_2 |
kpatch-patch-4_18_0-305_120_1 Red Hat:rhel_e4s:8.4::baseos | All versions | 0:1-3.el8_4 |
kpatch-patch-4_18_0-305_120_1-debuginfo Red Hat:rhel_e4s:8.4::baseos | All versions | 0:1-3.el8_4 |
kpatch-patch-4_18_0-305_120_1-debugsource Red Hat:rhel_e4s:8.4::baseos | All versions | 0:1-3.el8_4 |
kpatch-patch-4_18_0-372_64_1 Red Hat:rhel_eus:8.6::baseos | All versions | 0:1-6.el8_6 |
kpatch-patch-4_18_0-372_64_1-debuginfo Red Hat:rhel_eus:8.6::baseos | All versions | 0:1-6.el8_6 |
kpatch-patch-4_18_0-372_64_1-debugsource Red Hat:rhel_eus:8.6::baseos | All versions | 0:1-6.el8_6 |
kpatch-patch-4_18_0-372_70_1 Red Hat:rhel_eus:8.6::baseos | All versions | 0:1-5.el8_6 |
Products include Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux.
How do I fix CVE-2023-6546?
Apply the vendor's patch.
Is CVE-2023-6546 being exploited?
There is no known exploitation of CVE-2023-6546 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as AZL-32284, DEBIAN-CVE-2023-6546, GHSA-v727-f437-6cxx, OESA-2023-1990, RHSA-2024:0937, RHSA-2024:1055 and 4 more.