CVE-2019-3843: canonical ubuntu_linux Incorrect Privilege Assignment
Vulnerability summary
CVE-2019-3843 is a high (CVSS 7.8) Incorrect Privilege Assignment vulnerability in canonical ubuntu_linux. EPSS estimates a 0.94% chance of exploitation in the next 30 days, higher than 60.9% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 4.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 5 · Related 5Timeline
- 26-04-2019PublishedVulnerability first disclosed.
- 09-06-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
8 scores · 5 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · ChainguardEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
- NVDNIST4.5MediumCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
EPSS trend
Probability
0.94%
Chance of exploitation in the next 30 days
Percentile
61%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.94% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundsystemd - DynamicUser can Create setuid Binaries when Assisted by Another Process
Maturity: poc
Weaknesses
CWE · root cause- CWE-266Incorrect Privilege AssignmentA product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.
- CWE-269Improper Privilege ManagementThe product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard5 products
- py3-systemdAll versions (No fix recorded)
- py3.10-systemdAll versions (No fix recorded)
- py3.11-systemdAll versions (No fix recorded)
- py3.12-systemdAll versions (No fix recorded)
- py3.13-systemdAll versions (No fix recorded)
Netapp4 products
[freedesktop.org]1 product
- systemd242
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 19.10
Debian1 product
- systemd< 242-4
Fedoraproject1 product
- fedoraEOL30
Systemd_project1 product
- systemd< 242
Ubuntu1 product
- systemd< 237-3ubuntu10.38
8 vendors · 15 products
References
13 links- bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3843X Refsource CONFIRMFIXIssue TrackingPatchThird Party Advisory
