{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2025-39682",
  "revision": 1,
  "title": "Linux Kernel — TLS Zero-Length Record Mishandling",
  "summary": "The Linux kernel's in-kernel Transport Layer Security (TLS) receive path mishandles a zero-length record held over from an earlier read, so later records are processed with wrong zero-copy assumptions, letting a local user crash the system or read data they should not.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 7.1,
    "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
    "version": "3.1"
  },
  "epss": 0.012,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": false,
    "attack_complexity": "low",
    "kev_added": "2026-09-18",
    "prerequisites": "Local access as a low-privileged user on a host that uses in-kernel TLS"
  },
  "remediation": {
    "patch_available": true
  },
  "recommended_action": "Update to a kernel build that carries the stable in-kernel TLS receive-path fix, starting with hosts that use in-kernel TLS.",
  "confidence": "medium",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2025-39682",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2025-39682",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2025-39682",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "claude-code"
    },
    {
      "fields": [
        "recommended_action",
        "tags"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2025-39682",
      "retrieved_at": "2026-09-20T11:09:51.520Z",
      "confidence": "high",
      "extractor": "human"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39682",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://git.kernel.org/stable/c/2902c3ebcca52ca845c03182000e8d71d3a5196f"
    },
    {
      "type": "vendor_advisory",
      "url": "https://git.kernel.org/stable/c/29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e"
    },
    {
      "type": "vendor_advisory",
      "url": "https://git.kernel.org/stable/c/3439c15ae91a517cf3c650ea15a8987699416ad9"
    }
  ],
  "published_at": "2025-09-05T18:15:44.670Z",
  "issued_at": "2026-09-20T10:52:56.734Z",
  "tags": [
    "linux",
    "kernel",
    "tls",
    "improper-check"
  ]
}