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Verdict

MEDIUM SEVERITY (CVSS 5.1)

What is this: Red Hat Libuser Race Condition Vulnerability (CWE-264) Affects Redhat Enterprise Linux 5.0.
Should you care: Rated medium severity — CVSS 5.1.
What to do: Patch when able.

INVESTIGATEHIGH EVIDENCE COVERAGEDeterministic · stored evidence only

Vulnerability investigation

Known exploitation makes this a patch priority

CISA confirms this vulnerability has been exploited in the wild. NVD rates the technical severity medium at CVSS 5.1. These are public vulnerability signals, not proof that a specific environment runs an affected version.

Exploitation status

CISA KEV · exploited in the wild

Added 2026-08-26.

30-day exploitation likelihood

Unavailable

FIRST EPSS did not return a score.

Technical severity

5.1 · medium

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected surface

6 parsed products

Libuser, Redhat Enterprise Linux 5.0, Redhat Enterprise Linux 6.0

Weakness class

CWE-264, CWE-367

CWE describes the weakness category, not whether a deployed product is reachable or exploitable.

Corpus evidence

3 connectors · 233 citations

No related report text is available in the local corpus.

What the evidence supports

Findings stay bounded to named sources and observable infrastructure.

3 findings

Confirmed exploitation in the wild

HIGH

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.

CISA KEV · added 2026-08-26 · action due 2026-09-09

The CISA due date applies to U.S. federal civilian agencies; other organizations should use the action as authoritative remediation guidance, not a universal legal deadline.

CVSS 5.1 medium technical impact

HIGH

Local · High · None

NIST NVD CVSS

CVSS measures technical severity and prerequisites; it does not measure observed exploitation likelihood.

What remains unknown

Whether your environment runs an affected product and version is not established by this public lookup.
Reachability, compensating controls, and successful exploitation in a specific environment are not checked.
No locally ingested public report supplies exploit, actor, or campaign context for this CVE.

Evidence readiness

The base CVE appears first. Independent evidence is added without blocking the page.

Investigation status

Checking for newly completed evidence

Refreshing

NIST NVD

NVD evidence is available in this response

Ready

CISA KEV

Listed in the local CISA KEV catalog

Ready

FIRST EPSS

Forensia does not request or publish EPSS while source rights are under review

Rights pending

Reports

Report links are still being resolved

Pending

Relationships

Product and vulnerability relationships are still being prepared

Pending

Affected products

Vendor/product strings parsed from local CPE URIs (no inferred ATT&CK).

Product	CPE (truncated)
Libuser Project Libuser	cpe:2.3:a:libuser_project:libuser::::::::
Opensuse Opensuse 13.2	cpe:2.3:o:opensuse:opensuse:13.2:::::::*
Redhat Enterprise Linux 7.0	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
Redhat Enterprise Linux 6.0	cpe:2.3:o:redhat:enterprise_linux:6.0:::::::*
Redhat Enterprise Linux 5.0	cpe:2.3:o:redhat:enterprise_linux:5.0:::::::*

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CVE-2015-3246