{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2026-53266",
  "revision": 1,
  "title": "Linux Kernel — Out-of-Bounds Write in ebtables Address Rewrite",
  "summary": "The Linux kernel's bridge firewall address-rewrite target copies a new hardware address into packet memory that may not be writable, including a file page spliced into the packet, so a local user can corrupt kernel memory. Exploitation has been seen in the wild.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 8.8,
    "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.00276,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": false,
    "attack_complexity": "low",
    "kev_added": "2026-09-18",
    "prerequisites": "A local low-privileged account on a host whose bridge firewall rules use the source-address rewrite target"
  },
  "remediation": {
    "patch_available": true
  },
  "mitre_attack": [
    "T1068"
  ],
  "kill_chain": "privilege_escalation",
  "recommended_action": "Update the kernel to a stable release carrying the ebtables fix now; prioritise hosts with bridge firewall rules where untrusted local users or code run.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
      "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-2026-53266",
      "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-2026-53266",
      "retrieved_at": "2026-09-20T10:52:56.734Z",
      "confidence": "high",
      "extractor": "claude-code"
    },
    {
      "fields": [
        "tags"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
      "retrieved_at": "2026-09-20T11:09:51.520Z",
      "confidence": "high",
      "extractor": "human"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
      "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/153ea96c806aea395daba907a4f88480b6ad5093"
    },
    {
      "type": "vendor_advisory",
      "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
    },
    {
      "type": "vendor_advisory",
      "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
    }
  ],
  "published_at": "2026-06-25T09:16:44.643Z",
  "issued_at": "2026-09-20T10:52:56.734Z",
  "tags": [
    "linux",
    "kernel",
    "netfilter",
    "ebtables",
    "out-of-bounds-write"
  ]
}