# CVE-2018-5407: Information disclosure in Processors supporting Simultaneous Multi-Threading > Local attackers can exploit timing side-channels in SMT processors to disclose sensitive information via port contention. - **Severity:** Medium 4.7 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N`) - **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:** Yes - **Published:** 15 Nov 2018 - **Updated:** 8 Oct 2026 - **Also known as:** ALPINE-CVE-2018-5407, DEBIAN-CVE-2018-5407, GHSA-3rjg-j575-7f6p, RHBA-2019:1053, RHBA-2019:1088, UBUNTU-CVE-2018-5407 ## What is CVE-2018-5407? CVE-2018-5407 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 15 Nov 2018. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'. Weakness: CWE-203 (Observable Discrepancy), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) ## Which versions are affected by CVE-2018-5407? It affects 20 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `imgbased` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:1.1.7-0.1.el7ev | | `ovirt-node-ng` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3.0-0.20181213.0.el7ev | | `ovirt-node-ng-nodectl` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3.0-0.20181213.0.el7ev | | `python-imgbased` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:1.1.7-0.1.el7ev | | `python2-ovirt-node-ng-nodectl` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3.0-0.20181213.0.el7ev | | `redhat-release-virtualization-host` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3-0.5.el7 | | `redhat-virtualization-host` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3-20190409.0.el7_6 | | `redhat-virtualization-host-image-update` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3-20190409.0.el7_6 | | `redhat-virtualization-host-image-update-placeholder` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3-0.5.el7 | | `rhvm-appliance` | Red Hat:enterprise_linux:7::hypervisor | All versions | 2:4.3-20190409.0.el7 | Products: Canonical Ubuntu Linux, Debian Debian Linux, Nodejs Node.js, Openssl Openssl, Oracle Api Gateway, Oracle Application Server, Oracle Enterprise Manager Base Platform, Oracle Enterprise Manager Ops Center, Oracle Mysql Enterprise Backup, Oracle Peoplesoft Enterprise Peopletools, Oracle Primavera P6 Enterprise Project Portfolio Management, Oracle Tuxedo, Oracle Vm Virtualbox, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Eus, Redhat Enterprise Linux Server Tus, Redhat Enterprise Linux Workstation, Tenable Nessus. ## How do I fix CVE-2018-5407? Apply the vendor's patch. ## Is CVE-2018-5407 being exploited? There is no known exploitation of CVE-2018-5407 in the wild and no public exploit code. Public exploit code: - Intel (Skylake / Kaby Lake) - 'PortSmash' CPU SMT Side-Channel (exploitdb) ## Other vulnerabilities in Canonical Ubuntu Linux - [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild) - [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2018-5407 and fix it if it is affected. What it is: CVE-2018-5407 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 15 Nov 2018. 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-2018-5407 in the wild and no public exploit code. Affected product: Canonical Ubuntu Linux. 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-2018-5407/ (Markdown: https://insights.sbomify.com/CVE-2018-5407/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2018-5407 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-5407 - OSV: https://osv.dev/vulnerability/CVE-2018-5407 --- From sbomify Insights: https://insights.sbomify.com/CVE-2018-5407/ Summaries are generated and may contain mistakes; the official description above is the record.