# CVE-2019-20386: Denial of service in n/a > A memory leak in systemd's logind button handling can lead to resource exhaustion and denial of service. - **Severity:** Medium 5.1 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 21 Jan 2020 - **Updated:** 9 Jun 2025 - **Also known as:** DEBIAN-CVE-2019-20386, GHSA-v2g8-4fgq-7rhx, RHSA-2020:4007, RHSA-2020:4553, SUSE-SU-2020:1828-1, SUSE-SU-2020:1842-1, UBUNTU-CVE-2019-20386 ## What is CVE-2019-20386? CVE-2019-20386 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 21 Jan 2020. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description An issue was discovered in button_open in login/logind-button.c in systemd before 243. When executing the udevadm trigger command, a memory leak may occur. Weakness: CWE-401 (Missing Release of Memory after Effective Lifetime) ## Which versions are affected by CVE-2019-20386? It affects 7 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `libgudev1` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `libgudev1-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd-journal-gateway` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd-libs` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd-networkd` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd-python` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd-resolved` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `systemd-sysv` | Red Hat:enterprise_linux:7::client | All versions | 0:219-78.el7 | | `libgudev1` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `libgudev1-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd-debuginfo` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd-journal-gateway` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd-libs` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd-networkd` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd-python` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd-resolved` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `systemd-sysv` | Red Hat:enterprise_linux:7::computenode | All versions | 0:219-78.el7 | | `libgudev1` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `libgudev1-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd-journal-gateway` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd-libs` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd-networkd` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd-python` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd-resolved` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `systemd-sysv` | Red Hat:enterprise_linux:7::server | All versions | 0:219-78.el7 | | `libgudev1` | Red Hat:enterprise_linux:7::workstation | All versions | 0:219-78.el7 | | `libgudev1-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:219-78.el7 | | `systemd` | Red Hat:enterprise_linux:7::workstation | All versions | 0:219-78.el7 | | `systemd-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 0:219-78.el7 | | `systemd-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:219-78.el7 | | `systemd-journal-gateway` | Red Hat:enterprise_linux:7::workstation | All versions | 0:219-78.el7 | | `systemd-libs` | Red Hat:enterprise_linux:7::workstation | All versions | 0:219-78.el7 | Products: Canonical Ubuntu Linux, Fedoraproject Fedora, Netapp Active Iq Unified Manager, Netapp Cloud Backup, Netapp Steelstore Cloud Integrated Storage, Opensuse Leap, Systemd Project Systemd. ## How do I fix CVE-2019-20386? Upgrade to a fixed version. ## Is CVE-2019-20386 being exploited? There is no known exploitation of CVE-2019-20386 in the wild and no public exploit code. ## 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-2019-20386 and fix it if it is affected. What it is: CVE-2019-20386 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 21 Jan 2020. 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-2019-20386 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-2019-20386/ (Markdown: https://insights.sbomify.com/CVE-2019-20386/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20386 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20386 - OSV: https://osv.dev/vulnerability/CVE-2019-20386 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-20386/ Summaries are generated and may contain mistakes; the official description above is the record.