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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00209.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
6fd3620b342861de9547ea01d28f664892ef51a1 affected < 511a60e71aec308b24722cffc1912bf6befb87bf
6fd3620b342861de9547ea01d28f664892ef51a1 affected < 11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6
6fd3620b342861de9547ea01d28f664892ef51a1 affected < da5234df0941665f3a3f5b80f3dab94046537be0
6fd3620b342861de9547ea01d28f664892ef51a1 affected < b91e27bce37cab9f35de0059278ebe457ca9878b
6fd3620b342861de9547ea01d28f664892ef51a1 affected < cd681403a87085562499d60325b7b45d3be11217
Linux Linux affected
Version Status Constraints
5.19 affected —
0 unaffected < 5.19
6.6.145 unaffected ≤ 6.6.*
6.12.97 unaffected ≤ 6.12.*
6.18.40 unaffected ≤ 6.18.*
7.1.5 unaffected ≤ 7.1.*
7.2-rc1 unaffected ≤ *

No data.

No data.

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6 cve-icon cve-icon
https://git.kernel.org/stable/c/511a60e71aec308b24722cffc1912bf6befb87bf cve-icon cve-icon
https://git.kernel.org/stable/c/b91e27bce37cab9f35de0059278ebe457ca9878b cve-icon cve-icon
https://git.kernel.org/stable/c/cd681403a87085562499d60325b7b45d3be11217 cve-icon cve-icon
https://git.kernel.org/stable/c/da5234df0941665f3a3f5b80f3dab94046537be0 cve-icon cve-icon
History

Sat, 15 Aug 2026 06:00:00 +0000

Type Values Removed Values Added
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.
Title mm/mm_init: fix uninitialized struct pages for ZONE_DEVICE
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-15T05:53:37.795Z

Reserved: 2026-08-09T03:40:39.910Z

Link: CVE-2026-72172

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T06:21:35.353

Modified: 2026-08-15T06:21:35.353

Link: CVE-2026-72172

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-15T09:15:04Z

Weaknesses

No weakness.