Linux Kernel PCI/P2PDMA Vulnerability in Memory Allocation Function

CVE-2026-46268

What is CVE-2026-46268?

A vulnerability has been identified in the Linux kernel's PCI/P2PDMA component concerning the memory allocation function, p2pmem_alloc_mmap(). This issue arises due to an improper assertion that checks the page reference count, leading to potential warnings when CONFIG_DEBUG_VM is enabled. Specifically, the warning is triggered when the initial page reference count is erroneously set to zero, which is contrary to the expectation that it should be non-zero. The issue has been resolved by modifying the assertion to correctly utilize the page reference count, ensuring enhanced stability and reliability in memory allocation processes.

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