Linux Kernel Missing Initialization of a Variable Vulnerability

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• NewsExploited · CISA KEVLinux · Kernel

  Linux Kernel Missing Initialization of a Variable Vulnerability

  CVE-2026-46300

  Linux Kernel contains a missing initialization of a variable vulnerability that could allow for unintended modification of page-cache-backed data via failure to preserve the shared-fragment marker during socket buffer coalescing, causing ESP input processing to decrypt shared fragments in place. This vulnerability can be chained with CVE-2026-109618 and CVE-2026-109619 to implant PHP webshells and run commands as root.

  CISA's required action · due 31 Oct 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 28 Oct 2026 · Source checked 4 Nov 2026, 16:25 UTC · CISA KEV entry

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