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CVE-2025-39727 is a buffer-overflow vulnerability in the Linux kernel memory-management swap subsystem. During swap-map setup, setup_swap_map() validates badpage values only against the range (0, last_page]. Because maxpages can be smaller than last_page, setup_clusters() may process a badpage value greater than or equal to maxpages and write beyond the cluster-information buffer through inc_cluster_info_page(). The fix limits calls to inc_cluster_info_page() to badpage values below maxpages.
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Potential buffer overflow in the Linux kernel swap subsystem's setup_clusters() function.
A potential buffer-overflow vulnerability in the Linux kernel memory-management swap setup_clusters() function.
A Linux kernel memory-management swap subsystem buffer overflow in setup_clusters(). Improper validation permits a badpage index that is valid relative to last_page but outside maxpages, causing an out-of-bounds operation during cluster information setup.
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Cross-references every affected SKU, including bundled OEM variants.
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