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

criticalknown exploitedpublic exploitCVE-2015-3246
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Red Hatproduct: libuserPrivilege escalationDenial of service
What
Race condition in libuser allows authenticated local users to corrupt /etc/passwd causing denial of service or privilege escalation.
Who is affected
Systems running Red Hat libuser with local user access.
Urgency
Critical; actively exploited with known attack chains.
Action
Patch or upgrade Red Hat libuser to a fixed version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-08-26
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2015-3246

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2015-3246coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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