CVE-2026-4105: systemd Improper Access Control
Vulnerability summary
CVE-2026-4105 is a medium (CVSS 6.7) Improper Access Control vulnerability in systemd. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 15 · Related 14Timeline
- 13-03-2026PublishedVulnerability first disclosed.
- 01-09-2026Last modifiedVulnerability information updated.
Description
A flaw was found in systemd. The systemd-machined service contains an Improper Access Control vulnerability due to insufficient validation of the class parameter in the RegisterMachine D-Bus (Desktop Bus) method. A local unprivileged user can exploit this by attempting to register a machine with a specific class value, which may leave behind a usable, attacker-controlled machine object. This allows the attacker to invoke methods on the privileged object, leading to the execution of arbitrary commands with root privileges on the host system.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
- NVDNIST6.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.15%
Chance of exploitation in the next 30 days
Percentile
4%
Versus all other CVEs
30-day change
+0.01 pp
From 0.14% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Suse2 products
- systemd&distro=SUSE Linux Enterprise Server 12 SP5-LTSS< 228-157.75.1
- systemd&distro=SUSE Linux Enterprise Server LTSS Extended Security 12 SP5< 228-157.75.1
Debian1 product
- systemd< 252.39-1~deb12u2 | < 257.13-1~deb13u1 | < 260~rc3-1
Ubuntu1 product
- systemdAll versions (No fix recorded)
3 vendors · 4 products
