CVE-2024-40948

mm/page_table_check: fix crash on ZONE_DEVICE

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.

N/A

CVSS

Severity:

EPSS 0.15%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2b
https://git.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0
https://git.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629
https://git.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43

Frequently Asked Questions

What is the severity of CVE-2024-40948?: CVE-2024-40948 has not yet been assigned a CVSS score.
How to fix CVE-2024-40948?: To fix CVE-2024-40948, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-40948 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-40948 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-40948?: CVE-2024-40948 affects Linux Linux, Linux Linux.

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