CVE-2026-46300: Linux Kernel Missing Initialization of a Variable Vulnerability
Summary
A vulnerability in the Linux Kernel, designated CVE-2026-46300, allows for unintended modification of page-cache-backed data. This can occur due to a failure to preserve the shared-fragment marker during socket buffer coalescing, leading to ESP input processing decrypting shared fragments in place. The vulnerability can be chained with other CVEs to enable remote command execution as root.
IFF Assessment
This vulnerability can be chained with others to gain root access and implant webshells, posing a significant threat to system security.
Severity
CISA KEV: Listed as actively exploited. Federal patch due: October 31, 2026. Known ransomware use: Unknown.
Defender Context
This vulnerability in the Linux Kernel requires immediate attention for defenders, especially those managing systems that can be exploited by chaining this issue with other known CVEs. Organizations should prioritize patching and applying vendor-provided mitigations to prevent unauthorized root access and potential ransomware deployment.