CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability

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.

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This report contains official claims from a government or institutional source and may not be independently verified.

Threat HighOfficial ClaimGovernmentConf ConfirmedUnited States · North AmericaPublishedCISA

Original publisher

CISA

Original source URL

https://access.redhat.com/articles/1537873

Source country

United States

Reporting region

North America

Language

Institution

CISA

Published (UTC)

Aug 26, 2026, 12:00 AM

Ingested (UTC)

Aug 28, 2026, 4:35 AM

Verification

Official Claim

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CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability
Vendor/project: Red Hat
Product: Libuser
Date added to KEV: 2026-08-26
Due date: 2026-09-09
Known ransomware use: Unknown
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
CISA KEV catalog entry for CVE-2015-3246
Original source: https://access.redhat.com/articles/1537873

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