VYPR
← All advisories
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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

49

Patches

Vulnerability mechanics

References

4

News mentions

0

No linked articles in our index yet.