Linux Kernel Vulnerability Affecting Process Copy Functionality

CVE-2026-64253

What is CVE-2026-64253?

A flaw in the Linux kernel exists where the copy_process function mishandles the PF_BLOCK_TS flag during process creation. When a new process is created, PF_BLOCK_TS is incorrectly inherited from the parent process even when the child’s plug pointer is reset to NULL. This could lead to assumptions about the validity of the plug pointer being violated, potentially allowing for unguarded dereferences and impacting system stability. The vulnerability has been addressed to ensure that PF_BLOCK_TS is cleared during process creation, maintaining the integrity of process management functions.

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