CVE-2019-3844: canonical ubuntu_linux Privilege Chaining
Vulnerability summary
CVE-2019-3844 is a high (CVSS 7.8) Privilege Chaining vulnerability in canonical ubuntu_linux. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 60.1% 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 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.
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
0.92%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.92% 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 causeAffected 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
Systemd_project1 product
- systemd< 242
Ubuntu1 product
- systemd< 237-3ubuntu10.38
7 vendors · 14 products
References
11 links- bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3844X Refsource CONFIRMFIXIssue TrackingPatchThird Party Advisory
