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CVE-2018-15686

HighPublished

systemd: reexec state injection: fgets() on overlong lines leads to line splitting

Published: Oct 26, 2018
Updated: Jun 9, 2025
Assigning CNA: canonical
Evidence observed: Oct 29, 2018

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

2.3%

Low · next 30 days

Percentile: 82.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A vulnerability in unit_deserialize of systemd allows an attacker to supply arbitrary state across systemd re-execution via NotifyAccess. This can be used to improperly influence systemd execution and possibly lead to root privilege escalation. Affected releases are systemd versions up to and including 239.

Sources

systemd - 'reexec' State InjectionExploit
Google Security Research · linux · Oct 29, 2018

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