CVE-2024-40948
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-40948
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-40948.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-40948
- Downstream
- Related
- Published
- 2024-07-12T13:15:17Z
- Modified
- 2025-08-09T20:01:26Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
mm/pagetablecheck: fix crash on ZONE_DEVICE
Not all pages may apply to pgtable check. One example is ZONEDEVICE pages: they map PFNs directly, and they don't allocate pageext at all even if there's struct page around. One may reference devmmemremappages().
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/pagetablecheck.c:55!
While it's pretty legal to use setpxxat() for ZONEDEVICE pages for page fault resolutions, skip all the checks if pageext doesn't even exist in pgtable checker, which applies to ZONE_DEVICE but maybe more.
- References