5.5

CVE-2026-40223: systemd_project systemd Incorrect Behavior Order

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-40223DEBIAN-CVE-2026-40223
Published 10-04-2026Last modified 15-04-2026
Open JSON

Vulnerability summary

CVE-2026-40223 is a medium (CVSS 5.5) Incorrect Behavior Order vulnerability in systemd_project systemd. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.8% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.12%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2026:7299

Timeline

  1. 10-04-2026
    PublishedVulnerability first disclosed.
  2. 15-04-2026
    Last modifiedVulnerability information updated.

Description

In systemd 258 before 260, a local unprivileged user can trigger an assert when a Delegate=yes and User=<unset> unit exists and is running.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

+0.04 pp

From 0.09% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.12%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • systemd< 260~rc1-1
Systemd1 product
Systemd_project1 product
Ubuntu1 product
  • systemdAll versions (No fix recorded)

4 vendors · 4 products

References

4 links