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

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

• Documented mitigation — access.redhat.com (NIST National Vulnerability Database)

CISA required action CISA

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.

US federal deadline: Sep 9, 2026 — passed 36 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Libuser Project Libuser, Opensuse Opensuse, Red Hat Enterprise Linux).
2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
3. Apply the documented mitigations until a definitive fix is available.
4. EPSS ahead of 95% of scored CVEs: prioritize it in the patch queue.
5. Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-264 · Permissions, Privileges, and Access Controls

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 12, 2026 → Oct 14, 2026 · 3 reading(s) · max 8.50%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
• Audit administrative actions and access to resources outside each user’s normal pattern.
• Hunt retroactively in logs from before Aug 26, 2026 (KEV listing): exploitation may have started earlier.

Timeline

What happened to this CVE, newest first.

• 2026
• Fix documented
  Oct 13, 2026 · NIST National Vulnerability Database
• Affected products added · redhat/enterprise linux, opensuse/opensuse, libuser project/libuser
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · Published → Analyzed
  Oct 13, 2026 · NIST National Vulnerability Database
• Record published
  Oct 13, 2026
• CVSS changed · 7.4
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Source status changed · → Published
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Added to CISA KEV (detected)
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• Record created in this database
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• Added to CISA KEV catalog
  Aug 25, 2026 · CISA
• 2015
• CVE published
  Aug 11, 2015 · redhat

Source activity

Repeated readings are counted rather than listed.

• 3× References added · Oct 13, 2026 – Oct 13, 2026
• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

16 on the record

• rhn.redhat.com/errata/RHSA-2015-1482.html
  vendor-advisory, x_refsource_REDHAT, Vendor Advisory, CVE Program (cve.org) e CISA ADP
• access.redhat.com/articles/1537873
  x_refsource_CONFIRM, Mitigation, Vendor Advisory, CVE Program (cve.org) e CISA ADP
• rhn.redhat.com/errata/RHSA-2015-1483.html
  vendor-advisory, x_refsource_REDHAT, Vendor Advisory, CVE Program (cve.org) e CISA ADP
• www.cisa.gov/known-exploited-vulnerabilities-catalog
  US Government Resource, NIST National Vulnerability Database
• lists.fedoraproject.org/pipermail/package-announce/2015-July/162947.html
  vendor-advisory, x_refsource_FEDORA, Broken Link, CVE Program (cve.org) e CISA ADP
• www.securityfocus.com/bid/76022
  vdb-entry, x_refsource_BID, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• github.com/advisories/GHSA-f52h-j689-x786
  GitHub Security Advisories
• www.qualys.com/2015/07/23/cve-2015-3245-cve-2015-3246/cve-2015-3245-cve-2015-3246.tx
  x_refsource_MISC, Exploit, CVE Program (cve.org) e CISA ADP
• lists.fedoraproject.org/pipermail/package-announce/2015-August/163044.html
  vendor-advisory, x_refsource_FEDORA, Broken Link, CVE Program (cve.org) e CISA ADP
• www.exploit-db.com/exploits/44633
  GitHub Security Advisories
• lists.opensuse.org/opensuse-security-announce/2015-08/msg00000.html
  vendor-advisory, x_refsource_SUSE, Mailing List, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-
  Third Party Advisory, NIST National Vulnerability Database
• nvd.nist.gov/vuln/detail/CVE-2015-3246
  GitHub Security Advisories
• blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-
  GitHub Security Advisories
• www.securitytracker.com/id/1033040
  vdb-entry, x_refsource_SECTRACK, Third Party Advisory, CVE Program (cve.org) e CISA ADP
• www.exploit-db.com/exploits/44633/
  exploit, x_refsource_EXPLOIT-DB, Third Party Advisory, VDB Entry, CVE Program (cve.org) e CISA ADP

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2026-104046 Sssd: sssd: denial of service via incomplete identity provider authentication requests 9d
• Medium CVE-2026-104045 Sssd: sssd: denial of service via race condition in autofs responder 9d
• High CVE-2026-104048 Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation 9d
• Medium CVE-2026-104047 Sssd: sssd: information disclosure via query injection in entra id lookups 9d
• High CVE-2026-102558 Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth 16d
• High CVE-2026-102555 Libsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding 16d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2015-3246 is "Red Hat Libuser Race Condition Vulnerability", rated High. It affects Libuser (Libuser Project); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 7.4 describes technical severity. EPSS 8.50% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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