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CVE-2026-46300

Linux Kernel Missing Initialization of a Variable Vulnerability

Exploited in the wild

This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-10-28. Federal due date: 2026-10-31.

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.

Public exploit code

Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.

Impact

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.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 3.9 through 5.10.257
from 5.11 before 5.15.208
from 5.16 before 6.1.174
from 6.2 before 6.6.141
from 6.7 before 6.12.91
from 6.13 before 6.18.33
SiemensSimatic S7-1500 Cpu 1518-4 Pn\/Dp Mfp Firmware
from 3.1.5 through 3.1.6
RedhatOpenshift Container Platform
from 4.12 before 4.12.91
from 4.13 before 4.13.67
from 4.14 before 4.14.68
from 4.15 before 4.15.65
from 4.16 before 4.16.63
from 4.17 before 4.17.55
RedhatEnterprise Linux
Versions 6.0, 7.0, 8.0, 9.0, 10.0
RedhatEnterprise Linux Aus
Versions 8.4, 8.6
RedhatEnterprise Linux Eus
Versions 8.4, 9.4, 9.6, 10.0
RedhatEnterprise Linux Tus
Versions 8.6, 8.8
RedhatEnterprise Linux Update Services For Sap Solutions
Versions 8.6, 8.8, 9.0, 9.2, 9.4

Weakness classification

CWE-456CWE-787CWE-123

References