Linux Kernel Missing Initialization of a Variable Vulnerability

What's happening and what to do

Attackers can modify data cached in memory for files on the system, and chained with other flaws they can plant PHP webshells and run commands as root. Linux Kernel. Apply the vendor's update now and check for signs of compromise, such as unexpected PHP files or unknown root processes.

AI summary of the sources on this page. Regenerated when a source changes.

Signals over time

2026-10-28Added to CISA's Known Exploited Vulnerabilities catalog.
2026-10-31Federal patch deadline for US agencies.
2026-11-03 21:55First seen here.

Source text

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.