First published Oct 28, 2026, 7:51:15 PM UTC · Last updated Oct 28, 2026, 7:51:15 PM UTC

CVE-2026-46300: Linux Kernel Missing Initialization of a Variable Vulnerability

Reported by CISA Known Exploited Vulnerabilities

The source describes a Linux Kernel vulnerability that may permit in-place decryption of shared fragments and, when chained with two other CVEs, PHP webshell installation and root command execution. It calls for applying vendor mitigations and following CISA patching guidance.

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Why it matters

The source identifies potential root-level command execution and directs stakeholders to mitigate the vulnerability or discontinue use if mitigations are unavailable.

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 6/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 1/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 3/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 4/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 5/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

CISA Known Exploited Vulnerabilities CVE-2026-46300: Linux Kernel Missing Initialization of a Variable Vulnerability

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