CVE-2026-72172
Description
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.
How to fix
- Linux Linuxc5ef574d57e4a701485c13f26822328c91f05413, 511a60e71aec308b24722cffc1912bf6befb87bf, 11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6, da5234df0941665f3a3f5b80f3dab94046537be0, b91e27bce37cab9f35de0059278ebe457ca9878b, cd681403a87085562499d60325b7b45d3be11217 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 6fd3620b342861de9547ea01d28f664892ef51a1 ≤ v < c5ef574d57e4a701485c13f26822328c91f05413, 6fd3620b342861de9547ea01d28f664892ef51a1 ≤ v < 511a60e71aec308b24722cffc1912bf6befb87bf, 6fd3620b342861de9547ea01d28f664892ef51a1 ≤ v < 11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6, 6fd3620b342861de9547ea01d28f664892ef51a1 ≤ v < da5234df0941665f3a3f5b80f3dab94046537be0, 6fd3620b342861de9547ea01d28f664892ef51a1 ≤ v < b91e27bce37cab9f35de0059278ebe457ca9878b, 6fd3620b342861de9547ea01d28f664892ef51a1 ≤ v < cd681403a87085562499d60325b7b45d3be11217, 5.19 | c5ef574d57e4a701485c13f26822328c91f05413, 511a60e71aec308b24722cffc1912bf6befb87bf, 11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6, da5234df0941665f3a3f5b80f3dab94046537be0, b91e27bce37cab9f35de0059278ebe457ca9878b, cd681403a87085562499d60325b7b45d3be11217 |
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