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Unrated severityNVD Advisory· Published Jul 12, 2024· Updated Nov 3, 2025

mm/page_table_check: fix crash on ZONE_DEVICE

CVE-2024-40948

Description

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

mm/page_table_check: fix crash on ZONE_DEVICE

Not all pages may apply to pgtable check. One example is ZONE_DEVICE pages: they map PFNs directly, and they don't allocate page_ext at all even if there's struct page around. One may reference devm_memremap_pages().

When both ZONE_DEVICE and page-table-check enabled, then try to map some dax memories, one can trigger kernel bug constantly now when the kernel was trying to inject some pfn maps on the dax device:

kernel BUG at mm/page_table_check.c:55!

While it's pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page fault resolutions, skip all the checks if page_ext doesn't even exist in pgtable checker, which applies to ZONE_DEVICE but maybe more.

Affected products

48

Patches

4
8bb592c2eca8
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
dec238224786
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
84d3549d54f5
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
51897f99351f
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

4

News mentions

0

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