CVE-2024-40948: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.17 — 6.1.96
linux	linux_kernel	6.2 — 6.6.36
linux	linux_kernel	6.7 — 6.9.7
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Other References

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-40948? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-40948? +

CVE-2024-40948 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-40948? +

CVE-2024-40948 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-40948? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-40948