{
  "id": "cve-2026-53266",
  "cveID": "CVE-2026-53266",
  "vendor": "Linux",
  "product": "Kernel",
  "vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability",
  "shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
  "requiredAction": "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.",
  "dateAdded": "2026-09-18",
  "dueDate": "2026-09-21",
  "knownRansomware": false,
  "cwes": [
    "CWE-787"
  ],
  "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
  "sources": [
    {
      "label": "NVD",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53266"
    },
    {
      "label": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
    },
    {
      "label": "git.kernel.org",
      "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
    },
    {
      "label": "cisa.gov",
      "url": "https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk"
    },
    {
      "label": "cisa.gov",
      "url": "https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk"
    },
    {
      "label": "nvd.nist.gov",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53266"
    }
  ],
  "cvss": {
    "score": 8.8,
    "severity": "HIGH",
    "version": "3.1",
    "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
  },
  "epss": {
    "score": 0.00827,
    "percentile": 0.56067
  },
  "timeline": [
    {
      "date": "2026-09-18",
      "event": "Added to the CISA KEV catalog"
    },
    {
      "date": "2026-09-21",
      "event": "CISA remediation due date (BOD 22-01)"
    }
  ],
  "status": "past due"
}