CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability
Affects Red Hat LibuserSource CISA KEV
No CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 08/26/2026
- KEV deadline
- 09/09/2026
- EPSS
- 8.5% chance of exploitation in 30 days – higher than 95% of CVEs
What to do
CISA 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.
- access.redhat.com/articles/1537873 (opens in a new tab)
- cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (opens in a new tab)
- cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2015-3246 (opens in a new tab)
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.
References
- access.redhat.com/articles/1537873 (opens in a new tab)
- cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (opens in a new tab)
- cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2015-3246 (opens in a new tab)
- cisa.gov/known-exploited-vulnerabilities-catalog?search=CVE-2015-3246 (opens in a new tab)