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CVE-2024-40948

5.5 · MEDIUM

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.

Published Jul 12, 2024EPSS 0.25%

Overview

CVE-2024-40948 is a medium-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2bRefgit.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0Refgit.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43Refgit.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629Refgit.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2bRefgit.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0Refgit.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43Refgit.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629Reflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-40948?

CVE-2024-40948 is a medium-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-40948?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-40948?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-40948?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-40948 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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