In the Linux kernel, the following vulnerability has been resolved:

mm: swap: fix potential buffer overflow in setup_clusters()

In setup_swap_map(), we only ensure badpages are in range (0, last_page].
As maxpages might be < last_page, setup_clusters() will encounter a buffer
overflow when a badpage is >= maxpages.

Only call inc_cluster_info_page() for badpage which is < maxpages to fix
the issue.

References

• https://nvd.nist.gov/vuln/detail/CVE-2025-39727
• https://git.kernel.org/stable/c/152c1339dc13ad46f1b136e8693de15980750835
• https://git.kernel.org/stable/c/815c528b13f2bb9b3130c13bedeabf2351a68129
• https://git.kernel.org/stable/c/91b370800b3f2b3dda244c0ab06719c4971190a5
• https://git.kernel.org/stable/c/9b01ada580ee84fb319e7ecb5fb5b1f54a9eb799