CVE-2015-3246
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…
Not rated yet
Known exploited
- Severity
- Not rated yet
- No source has published a CVSS score yet
- Exploit chance (EPSS)
- 8.50%
- Chance of exploitation in the next 30 days. Higher than 95.04% of scored vulnerabilities.
- Known exploited
- Yes
- In CISA's catalog since Aug 26, 2026
- Weakness
- —
- Not classified
- Fix
- None yet
- No fixed version published
Exploited in the wild. Red Hat Libuser Race Condition Vulnerability (Red Hat Libuser). 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. Due for U.S. federal agencies by Sep 9, 2026.
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.
How to fix
No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.
References
Advisories
Exploits and evidence
Other links
- lists.fedoraproject.org/pipermail/package-announce/2015-August/163044.html
- lists.fedoraproject.org/pipermail/package-announce/2015-July/162947.html
- lists.opensuse.org/opensuse-security-announce/2015-08/msg00000.html
- securityfocus.com/bid/76022
- securitytracker.com/id/1033040
- access.redhat.com/articles/1537873
- exploit-db.com/exploits/44633
Timeline
- Published
- Last updated by the source
- Added to CISA's Known Exploited Vulnerabilities catalog
- Remediation due for U.S. federal agencies
- Latest EPSS score
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