[悪用確認] CVE-2026-53266: Linux Kernel Out-of-Bounds Write Vulnerability

Linux Kernel 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. 対応: 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. (期限 2026-09-21)

Read on CISA Known Exploited Vulnerabilities

On 09/18/2026, 09:00 AM, CISA Known Exploited Vulnerabilities published "[悪用確認] CVE-2026-53266: Linux Kernel Out-of-Bounds Write Vulnerability" (type: Advisory). Severity is "Critical" (critical). CVE: CVE-2026-53266.