Use-After-Free Vulnerability in Linux Kernel PCI Subsystem

CVE-2023-53363

What is CVE-2023-53363?

A use-after-free vulnerability has been identified in the PCI subsystem of the Linux kernel. This flaw occurs during the cleanup of bus removal, specifically within the function pci_bus_release_domain_nr(), which accesses memory that has already been deallocated. This issue emerged after recent code modifications and has been linked to improper management of memory during device deregistration. Proper reordering of function calls during the teardown process is critical to preventing this security risk. It emphasizes the importance of careful memory management in kernel development to thwart potential exploitation vectors that could arise from accessing freed memory.

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