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high7.4Known exploitedPublic exploit code

CVE-2015-3246

Red Hat Libuser Race Condition Vulnerability

Exploited in the wild

This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-08-26. Federal due date: 2026-09-09.

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.

Public exploit code

Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.

Impact

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.

Affected products

VendorProductAffected versions
RedhatEnterprise Linux
Versions 5.0, 6.0, 7.0
OpensuseOpensuse
Version 13.2
Libuser ProjectLibuser
before 0.56.13-8
from 0.60 before 0.60-7

Weakness classification

CWE-264CWE-367

References