— Unscored

Linux Kernel Missing Initialization of a Variable Vulnerability

CVE-2026-46300 Exploited

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.

Being exploited in the wild

Catalogued 28 October 2026 · US federal remediation deadline 31 October 2026

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…

Exploit code is also public: Metasploit · Exploit-DB · Public PoC

Metasploitexploit/linux/local/cve_2026_46300_fragnesia
Exploit-DBLinux Kernel - Local Privilege Escalation
Public PoC0xBlackash/CVE-2026-4630016 stars
Public PoCMadExploits/CVE-2026-463003 stars
Public PoCHORKimhab/CVE-2026-463002 stars
Public PoCazilRababe/CVE-2026-463002 stars
Public PoCSentebale/CVE-2026-463001 stars
Public PoC1neptune/Fragnesia1 stars
Public PoCExploitEoom/CVE-2026-46300
Public PoCFirst-John/cve_2026_frag_family_fix

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Yes — listed in the CISA KEV catalog
Exploit availability: CISA KEV, Metasploit, Exploit-DB, Public PoC
Published: 28 October 2026
Last updated: 28 October 2026
Affected: Linux · Kernel
Weakness: CWE-456

At the source

CISA KEV

References

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