Linux Kernel Out-of-Bounds Write Vulnerability

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• NewsExploited · CISA KEVLinux · Kernel

  Linux Kernel Out-of-Bounds Write Vulnerability

  CVE-2026-53266

  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.

  CISA's required action · due 21 Sep 2026 for U.S. federal civilian agencies

  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.

  Cited by CISA: git.kernel.org · git.kernel.org · git.kernel.org · git.kernel.org +5 more at the source

  Added to KEV 18 Sep 2026 · Source checked 4 Nov 2026, 16:25 UTC · CISA KEV entry

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