CVE WatchAug 27, 2026

CVE-2015-3246

Red Hat Libuser Race Condition Vulnerability

CVSS

5.1

Medium

EPSS

8.8%

p95

KEV

YES

Aug 26, 2026

Exploit Today

0-100

Published: Aug 11, 2015 · Last modified: Aug 27, 2026 · CWE-264 · CWE-367

EPSS · 30d

6.8%EPSS · 30 days8.8%

2026-08-202026-09-17

KEV catalog record

Product

Red Hat / Libuser

Vulnerability

Red Hat Libuser Race Condition Vulnerability

Added to KEV

Aug 26, 2026

Remediate by

Sep 9, 2026

Known ransomware use

Summary description

Red Hat libuser contains a race condition vulnerability that allows authenticated local users to corrupt the /etc/passwd file to cause a denial of service or privilege escalation.

Required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Notes

This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://access.redhat.com/articles/1537873 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2015-3246

Technical description

libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, directly modifies /etc/passwd, which allows local users to cause a denial of service (inconsistent file state) by causing an error during the modification. NOTE: this issue can be combined with CVE-2015-3245 to gain privileges.

Official references

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