CVE-2026-72172
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
mm/mm_init: fix uninitialized struct pages for ZONE_DEVICE
If DAX memory is hotplugged into an unoccupied subsection of an early
section, section_activate() reuses the unoptimized boot memmap. However,
compound_nr_pages() still assumes that vmemmap optimization is in effect
and initializes only the reduced number of struct pages. As a result, the
remaining tail struct pages are left uninitialized, which can later lead
to unexpected behavior or crashes.
Fix this by treating early sections as unoptimized when calculating how
many struct pages to initialize.
https://git.kernel.org/stable/c/11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6
https://git.kernel.org/stable/c/511a60e71aec308b24722cffc1912bf6befb87bf
https://git.kernel.org/stable/c/b91e27bce37cab9f35de0059278ebe457ca9878b
https://git.kernel.org/stable/c/cd681403a87085562499d60325b7b45d3be11217
https://git.kernel.org/stable/c/da5234df0941665f3a3f5b80f3dab94046537be0