OBS-2026-000251: CVE-2025-39682

1. Observe What changed? →

2. Understand Why does it matter? →

3. Track How does risk evolve? →

4. Predict What happens next? →

5. Decide What to do? →

6. Verify What happened? →

7. Remember Persistent memory

IMMUTABLE CANONICAL OBSERVATION

OBS-2026-000251

Target Entity: CVE-2025-39682 — Linux Kernel kTLS Receive Path Zero-Length Record UAF

MODE: LIVE

Methodology: HTS-3.1

Observed UTC:
2026-09-18T00:00:00.000Z

Event Date:
2026-09-18

Epistemic State:
● KNOWN

Cryptographic Digest:
sha256-d468d6312b0676d…

1. Verified Evidence & Observed State

This canonical observation confirms the following factual event on the threat surface:

Hermes Threat Score (HTS)

94 / 100

CRITICAL

CVSS v3.1

N/A

Not Available

EPSS (30-Day Exploitation)

N/A

Percentile: N/A

Weaponization & CISA KEV

🚨 Listed in CISA KEV

Exploit Maturity: weaponized

2. Decomposed Epistemic Confidence Vector

Hermes rejects false certainty and explicitly exposes its decomposed confidence vector:

Evidence Integrity98%

Model Stability96%

Data Completeness95%

Actionable Decisiveness95%

3. Primary Sources & Provenance Chain

Observation OBS-2026-000251 is strictly anchored to verified records from the following primary entities:

CISA KEV
NVD
Hermes Codex Research

Causal Intelligence Lineage

Primary Source → OBS-2026-000251 → CVE-2025-39682 → Risk Trajectory → Action Directive

4. Target Entity & Correlated Intelligence

Primary Vulnerability Dossier: CVE-2025-39682
Impacted Software Product : Linux Kernel Core (linux ecosystem)
Dynamic Risk Trajectories: View risk trajectory analysis
Decision Engine: View prescriptive remediation directives

5. Observation Sequence & Chain of Custody

Chronological lineage for entity CVE-2025-39682:

Preceding Observation: OBS-2025-000029
Succeeding Observation: OBS-2026-000030

Observation ID	Date	Mode	Score	Observed Fact
`OBS-2025-000029`	`2025-08-20`	RETROSPECTIVE	65	Initial disclosure in net/tls/tls_sw.c; vendor patches issued.
👉 `OBS-2026-000251`	`2026-09-18`	LIVE	94	CISA adds to KEV catalog with mandatory BOD 22-01 remediation deadline.
`OBS-2026-000030`	`2026-09-19`	LIVE	94	Hermes confirms weaponized exploitation across enterprise Linux fleets.

6. Reproducibility & Cryptographic Verification

(Section 77 Mandate: “Observations must be reproducible”)

Fetch and verify this observation record directly from the machine-readable API:

# 1. Fetch canonical observation record
curl -sSL https://hermes-codex.vercel.app/api/observations/OBS-2026-000251.json

# 2. Verify cryptographic SHA-256 integrity
curl -sSL https://hermes-codex.vercel.app/api/observations/OBS-2026-000251.json | sha256sum

OASIS STIX 2.1 Mapping (`observed-data`)

{
  "type": "observed-data",
  "spec_version": "2.1",
  "id": "observed-data--fdd479cb-b46a-da5d-a2cc-d8f6961523c8",
  "created_by_ref": "identity--hermes-codex-threat-observatory",
  "created": "2026-09-18T00:00:00.000Z",
  "modified": "2026-09-18T00:00:00.000Z",
  "first_observed": "2026-09-18T00:00:00.000Z",
  "last_observed": "2026-09-18T00:00:00.000Z",
  "number_observed": 1,
  "external_references": [
    {
      "source_name": "hermes-codex",
      "external_id": "OBS-2026-000251",
      "url": "https://hermes-codex.vercel.app/observations/obs-2026-000251/"
    }
  ],
  "object_marking_refs": [
    "marking-definition--tlp-clear"
  ],
  "custom_properties": {
    "x_hermes_threat_score": 94,
    "x_hermes_severity": "CRITICAL",
    "x_hermes_epistemic_state": "KNOWN",
    "x_hermes_methodology": "HTS-3.1",
    "x_hermes_integrity_hash": "sha256-d468d6312b0676d08cc02d21e01e75da2bbfc1bf57688d5c1a73905f1a367209"
  }
}