Description
It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that would be allowed to run as the transient service UID/GID even after the service is terminated. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the UID/GID will be recycled.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| [freedesktop.org] | systemd | 242 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | systemd | 242-4 | — |
| Debian 13 | systemd | 242-4 | — |
| Debian 12 | systemd | 242-4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | systemd | 237-3ubuntu10.38 | USN-4269-1 |
| Ubuntu 16.04 LTS | systemd | 229-4ubuntu21.27 | USN-4269-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | systemd +7 | 239-29.el8 | RHSA-2020:1794 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | systemd | 234-24.30.1 | SUSE-SU-2019:1364-2 |
| SLES 15 | systemd | 234-24.30.1 | SUSE-SU-2019:1364-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | systemd | 249.4-2.2 | openSUSE-SU-2024:11420-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | systemd +7 | 239-29.0.1.el8 | ELSA-2020-1794 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- systemd - DynamicUser can Create setuid Binaries when Assisted by Another Process EDB-46760 · dos · Apr 26, 2019 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 7
- WID-SEC-2026-4026 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- USN-4269-1 systemd vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2019:1364-1 Security update for systemd SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11420-1 libsystemd0-249.4-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1364-2 Security update for systemd SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2020:1794 Red Hat Security Advisory: systemd security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- ELSA-2020-1794 Moderate: systemd security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 5, 2020
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3843
- FEDORA-2019-7322053e74 vendor-advisory
- 108116 vdb-entry
- https://security.netapp.com/advisory/ntap-20190619-0002/
- USN-4269-1 vendor-advisory
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list