systemd: services with DynamicUser can get new privileges and create SGID binaries
Published Apr 26, 2019
7.8
HIGHCVSS 3.1
EPSS 0.92%
Description
It was discovered that a systemd service that uses DynamicUser property can get new privileges through the execution of SUID binaries, which would allow to create binaries owned by the service transient group with the setgid bit set. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the GID will be recycled.
Affected products
- Vendor n/a Product Systemd Defaultn/a
- Version 242StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Systemd | n/a |
|
Configuration 1
- < 242
Configuration 2
- 16.04
- 18.04
- 19.10
Configuration 3
- n/a
- n/a
- n/a
Configuration 4
- n/a
No data.
Red Hat Enterprise Linux 8
systemd-0:239-29.el8
Fixed · RHSA-2020:1794
Red Hat Enterprise Linux 7
systemd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | systemd-0:239-29.el8 | Fixed | RHSA-2020:1794 |
| Red Hat Enterprise Linux 7 | systemd | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of systemd as shipped with Red Hat Enterprise Linux 7 as they did not include support for DynamicUser property.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
AV:L/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Jun 9, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.92% (0.00915) | 58.78th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.92% (0.00923) | 55.53th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.18% (0.00175) | 36.60th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.50% (0.01505) | 73.58th | v2 (v2022.01.01) |
| Mar 3, 2023 | 1.50% (0.01505) | 73.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.50% (0.01505) | 71.56th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.13% (0.03130) | 65.01th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.83% (0.05830) | 80.58th | v1 |
| Jan 6, 2022 | 5.83% (0.05830) | 80.38th | v1 |
| Sep 1, 2021 | 5.83% (0.05830) | 89.10th | v1 |
| Jun 30, 2021 | 5.83% (0.05830) | 0.00th | v1 |
| Jun 29, 2021 | 5.03% (0.05034) | 0.00th | v1 |
| Apr 14, 2021 | 4.23% (0.04225) | 0.00th | v1 |
References (10)
- http://www.securityfocus.com/bid/108096 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2019-3844 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1684610 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3844 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2019-3844
- https://security.netapp.com/advisory/ntap-20190619-0002/ x_refsource_CONFIRMThird Party Advisory
- https://usn.ubuntu.com/4269-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-3844
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/108096 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2019-3844 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1684610 | Issue Tracking | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3844 | x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory | |
| https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E | mailing-listx_refsource_MLIST | |
| https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-3844 | ||
| https://security.netapp.com/advisory/ntap-20190619-0002/ | x_refsource_CONFIRMThird Party Advisory | |
| https://usn.ubuntu.com/4269-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2019-3844 |
Change history (0)
No recorded changes yet.